Here is an answer Dave Stevens gave me in 2020.

"posted by Dave Stevens on Sat Jan 18 21:05 CST 2020
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed [IGNORE ALL POSTS]
last visit: Sun Jan 1 02:36 CST 2012
[RELATED]
A bit of further digging for you on the ABS vs. non-ABS master cyl turned up some useful stock brake info on Dave Barton's 240 big front brakes conversion page over on his 240turbo.com site, ref. https://www.240turbo.com/volvo240bigbrakes.html
(I can see a bunch of you now spending the rest of the evening reading up on that conversion -be sure to check out related posts on TurboBricks)

It says the master cyl primary bore is the same (22.3 mm), but the secondary bore for the front brakes is larger for the ABS master cyl (19 mm vs 15.75 mm for non-ABS).

Oh, and one correction to my story, while 740 ABS front calipers use the single piston clam shell design, the 240 ABS front calipers stayed with a 4 piston design, both pairs of pistons on the same left front or right front brake line circuit from the ABS module.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now"

Now the following site lists the ABS master cylinder and front calipers in their parts for sale. classicvolvorestoration.com

I don't know if these are still available though.

Here is an answer Dave Stevens gave me in 2020.

"posted by Dave Stevens on Sat Jan 18 21:05 CST 2020
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed [IGNORE ALL POSTS]
last visit: Sun Jan 1 02:36 CST 2012
[RELATED]
A bit of further digging for you on the ABS vs. non-ABS master cyl turned up some useful stock brake info on Dave Barton's 240 big front brakes conversion page over on his 240turbo.com site, ref. https://www.240turbo.com/volvo240bigbrakes.html
(I can see a bunch of you now spending the rest of the evening reading up on that conversion -be sure to check out related posts on TurboBricks)

It says the master cyl primary bore is the same (22.3 mm), but the secondary bore for the front brakes is larger for the ABS master cyl (19 mm vs 15.75 mm for non-ABS).

Oh, and one correction to my story, while 740 ABS front calipers use the single piston clam shell design, the 240 ABS front calipers stayed with a 4 piston design, both pairs of pistons on the same left front or right front brake line circuit from the ABS module.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now"

Now the following site lists the ABS master cylinder and front calipers in their parts for sale. classicvolvorestoration.com

I don't know if these are still available though.

Here is an answer Dave Stevens gave me in 2020.

"posted by Dave Stevens on Sat Jan 18 21:05 CST 2020
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed [IGNORE ALL POSTS]
last visit: Sun Jan 1 02:36 CST 2012
[RELATED]
A bit of further digging for you on the ABS vs. non-ABS master cyl turned up some useful stock brake info on Dave Barton's 240 big front brakes conversion page over on his 240turbo.com site, ref. https://www.240turbo.com/volvo240bigbrakes.html
(I can see a bunch of you now spending the rest of the evening reading up on that conversion -be sure to check out related posts on TurboBricks)

It says the master cyl primary bore is the same (22.3 mm), but the secondary bore for the front brakes is larger for the ABS master cyl (19 mm vs 15.75 mm for non-ABS).

Oh, and one correction to my story, while 740 ABS front calipers use the single piston clam shell design, the 240 ABS front calipers stayed with a 4 piston design, both pairs of pistons on the same left front or right front brake line circuit from the ABS module.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now"

Now the following site lists the ABS master cylinder and front calipers in their parts for sale. classicvolvorestoration.com

I don't know if these are still available though.

Here is an answer Dave Stevens gave me in 2020.

"posted by Dave Stevens on Sat Jan 18 21:05 CST 2020
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed [IGNORE ALL POSTS]
last visit: Sun Jan 1 02:36 CST 2012
[RELATED]
A bit of further digging for you on the ABS vs. non-ABS master cyl turned up some useful stock brake info on Dave Barton's 240 big front brakes conversion page over on his 240turbo.com site, ref. https://www.240turbo.com/volvo240bigbrakes.html
(I can see a bunch of you now spending the rest of the evening reading up on that conversion -be sure to check out related posts on TurboBricks)

It says the master cyl primary bore is the same (22.3 mm), but the secondary bore for the front brakes is larger for the ABS master cyl (19 mm vs 15.75 mm for non-ABS).

Oh, and one correction to my story, while 740 ABS front calipers use the single piston clam shell design, the 240 ABS front calipers stayed with a 4 piston design, both pairs of pistons on the same left front or right front brake line circuit from the ABS module.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now"

Now the following site lists the ABS master cylinder and front calipers in their parts for sale. classicvolvorestoration.com

I don't know if these are still available though.

Here is an answer Dave Stevens gave me in 2020.

"posted by Dave Stevens on Sat Jan 18 21:05 CST 2020
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed [IGNORE ALL POSTS]
last visit: Sun Jan 1 02:36 CST 2012
[RELATED]
A bit of further digging for you on the ABS vs. non-ABS master cyl turned up some useful stock brake info on Dave Barton's 240 big front brakes conversion page over on his 240turbo.com site, ref. https://www.240turbo.com/volvo240bigbrakes.html
(I can see a bunch of you now spending the rest of the evening reading up on that conversion -be sure to check out related posts on TurboBricks)

It says the master cyl primary bore is the same (22.3 mm), but the secondary bore for the front brakes is larger for the ABS master cyl (19 mm vs 15.75 mm for non-ABS).

Oh, and one correction to my story, while 740 ABS front calipers use the single piston clam shell design, the 240 ABS front calipers stayed with a 4 piston design, both pairs of pistons on the same left front or right front brake line circuit from the ABS module.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now"

Now the following site lists the ABS master cylinder and front calipers in their parts for sale. classicvolvorestoration.com

I don't know if these are still available though.

Here is an answer Dave Stevens gave me in 2020.

"posted by Dave Stevens on Sat Jan 18 21:05 CST 2020
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed [IGNORE ALL POSTS]
last visit: Sun Jan 1 02:36 CST 2012
[RELATED]
A bit of further digging for you on the ABS vs. non-ABS master cyl turned up some useful stock brake info on Dave Barton's 240 big front brakes conversion page over on his 240turbo.com site, ref. https://www.240turbo.com/volvo240bigbrakes.html
(I can see a bunch of you now spending the rest of the evening reading up on that conversion -be sure to check out related posts on TurboBricks)

It says the master cyl primary bore is the same (22.3 mm), but the secondary bore for the front brakes is larger for the ABS master cyl (19 mm vs 15.75 mm for non-ABS).

Oh, and one correction to my story, while 740 ABS front calipers use the single piston clam shell design, the 240 ABS front calipers stayed with a 4 piston design, both pairs of pistons on the same left front or right front brake line circuit from the ABS module.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now"

Now the following site lists the ABS master cylinder and front calipers in their parts for sale. classicvolvorestoration.com

I don't know if these are still available though.

Here is an answer Dave Stevens gave me in 2020.

"posted by Dave Stevens on Sat Jan 18 21:05 CST 2020
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed [IGNORE ALL POSTS]
last visit: Sun Jan 1 02:36 CST 2012
[RELATED]
A bit of further digging for you on the ABS vs. non-ABS master cyl turned up some useful stock brake info on Dave Barton's 240 big front brakes conversion page over on his 240turbo.com site, ref. https://www.240turbo.com/volvo240bigbrakes.html
(I can see a bunch of you now spending the rest of the evening reading up on that conversion -be sure to check out related posts on TurboBricks)

It says the master cyl primary bore is the same (22.3 mm), but the secondary bore for the front brakes is larger for the ABS master cyl (19 mm vs 15.75 mm for non-ABS).

Oh, and one correction to my story, while 740 ABS front calipers use the single piston clam shell design, the 240 ABS front calipers stayed with a 4 piston design, both pairs of pistons on the same left front or right front brake line circuit from the ABS module.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now"

Now the following site lists the ABS master cylinder and front calipers in their parts for sale. classicvolvorestoration.com

I don't know if these are still available though.

Here is an answer Dave Stevens gave me in 2020.

"posted by Dave Stevens on Sat Jan 18 21:05 CST 2020
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed [IGNORE ALL POSTS]
last visit: Sun Jan 1 02:36 CST 2012
[RELATED]
A bit of further digging for you on the ABS vs. non-ABS master cyl turned up some useful stock brake info on Dave Barton's 240 big front brakes conversion page over on his 240turbo.com site, ref. https://www.240turbo.com/volvo240bigbrakes.html
(I can see a bunch of you now spending the rest of the evening reading up on that conversion -be sure to check out related posts on TurboBricks)

It says the master cyl primary bore is the same (22.3 mm), but the secondary bore for the front brakes is larger for the ABS master cyl (19 mm vs 15.75 mm for non-ABS).

Oh, and one correction to my story, while 740 ABS front calipers use the single piston clam shell design, the 240 ABS front calipers stayed with a 4 piston design, both pairs of pistons on the same left front or right front brake line circuit from the ABS module.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now"

Now the following site lists the ABS master cylinder and front calipers in their parts for sale. classicvolvorestoration.com

I don't know if these are still available though.

Here is an answer Dave Stevens gave me in 2020.

"posted by Dave Stevens on Sat Jan 18 21:05 CST 2020
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed [IGNORE ALL POSTS]
last visit: Sun Jan 1 02:36 CST 2012
[RELATED]
A bit of further digging for you on the ABS vs. non-ABS master cyl turned up some useful stock brake info on Dave Barton's 240 big front brakes conversion page over on his 240turbo.com site, ref. https://www.240turbo.com/volvo240bigbrakes.html
(I can see a bunch of you now spending the rest of the evening reading up on that conversion -be sure to check out related posts on TurboBricks)

It says the master cyl primary bore is the same (22.3 mm), but the secondary bore for the front brakes is larger for the ABS master cyl (19 mm vs 15.75 mm for non-ABS).

Oh, and one correction to my story, while 740 ABS front calipers use the single piston clam shell design, the 240 ABS front calipers stayed with a 4 piston design, both pairs of pistons on the same left front or right front brake line circuit from the ABS module.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now"

Now the following site lists the ABS master cylinder and front calipers in their parts for sale. classicvolvorestoration.com

I don't know if these are still available though.

Here is an answer Dave Stevens gave me in 2020.

"posted by Dave Stevens on Sat Jan 18 21:05 CST 2020
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed [IGNORE ALL POSTS]
last visit: Sun Jan 1 02:36 CST 2012
[RELATED]
A bit of further digging for you on the ABS vs. non-ABS master cyl turned up some useful stock brake info on Dave Barton's 240 big front brakes conversion page over on his 240turbo.com site, ref. https://www.240turbo.com/volvo240bigbrakes.html
(I can see a bunch of you now spending the rest of the evening reading up on that conversion -be sure to check out related posts on TurboBricks)

It says the master cyl primary bore is the same (22.3 mm), but the secondary bore for the front brakes is larger for the ABS master cyl (19 mm vs 15.75 mm for non-ABS).

Oh, and one correction to my story, while 740 ABS front calipers use the single piston clam shell design, the 240 ABS front calipers stayed with a 4 piston design, both pairs of pistons on the same left front or right front brake line circuit from the ABS module.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now"

Now the following site lists the ABS master cylinder and front calipers in their parts for sale. classicvolvorestoration.com

I don't know if these are still available though.

I have a master cyl off a 94 940 w abs...
you can also try IPD or FCP which has it

Hi,

Interesting question, if there is a difference?

To best of my knowledge, though limited (:-), says that they didn’t reinvent the whole system but just built onto what has already worked for decades.

The ABS is a system of relieving pressures to each brake that is stopping before the others.
The releasing of those particular wheels can cause some pulsation of the pedal on early models and still might? I guess I have never used my brakes that hard to find out!

The master cylinder is ahead or on top, of all that mechanization.
So consequently, it should not make any difference in what goes on below its own pressurization task.
As long as you are standing on the Pistons, suppling an urgency, the apparatus below will release the proper wheel from locking up accordingly.

From my understanding most of the time the ABS system never goes into operation but only monitors the rotational speed of all the wheels until an urgency.

I have often wondered that if say one wheel slowed down more than the other say due to a wheel bearing locking up, what would it do?
In this scenario, I say nothing, because it’s not applying the brakes in the first place!
You grab harder on the wheel and drive it to a stop.
Same as turning a corner or making a circle, the wheels are changing speed slightly. There must be allowances for that.

Ah, but now let a wheel sensor get dirty or go bad that would probably trip a code light!
Does that happen only an application of brakes?

I don’t even know if the ABS would know anything about the master cylinder unless the low fluid switch sends a signal to the ABS box!
Now that would be a code along with a dash light that been there before the switch showed up.
I’ll have to look to see if the old “octopus,” with a grounding switch in it, is still on these cars nineties cars?
It alerted for a brake circuit pressure difference failure only.

I think the master cylinder would have to have the switch in the reservoir on ABS systems.
They did show up on our cars before ABS as my 1991 does not have ABS.
I surmise that ABS was an optional feature early on or a standard on say a GL model.
Of course, you have to throw in other countries with this mix of what was up with them!
Drawing boards can change faster than some contracts or parts on inventories!
This goes on in manufacturing constantly and dwindles on outward, as a knee jerk to the consumers, throughout the chain.

A separate part number, maybe, but in my thinking, either “Piston pusher” can work but the tops changed!
Swap out the reservoirs and hopefully the bottom ports, stayed the same?

(:-). Yep, hide and watch out, as for the words “electric hybrid,” is going to seem meek by comparison!

Will electric cars have or even use hydraulic disc brakes?
Only Motor controllers might work and wheel chocks for a dead
battery!

I think there was an answer in this post, somewhere?

Phil

No solution but a few suggestions to try:
1. Call FCP, IPD maybe they can obtain a new one for you.
2. Voluparts sells both new and used parts.
3. A used MC might be worth a shot at this point. Junkyards that perhaps specialize in Volvo or foreign cars. Particularly California dealers where the cars last a long time.
--
Will I buy another Volvo??? We'll see....