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Brake valve for 122?[ALL/1998] posted by Jeff Bushman on
Wednesday, 7 May 1997, at 6:33 p.m.

Hello everyone,

My 1967 122 Wagon's rear wheels are locking up on application of the brakes - the front disks never get a chance to kick in!

My mechanic says I need a brake proportioning valve - he has some Volvo experience and is reluctant to fiddle with the adjusting screws.

Questions: 1. 122 brake valves are seemingly hard to come by! Any recommendations for sources? 2. I've heard that perhaps 140-series valves will work. True? 3. Can they be successfully adjusted? Perhaps a turn of the screw is all that's required - the calibration process could be "interesting" however!

Thanks, Jeff.


Re: Brake valve for 122?[ALL/1998] posted by Jim McDonald on
Thursday, 8 May 1997, at 4:05 p.m.

Most of the 122/1800 proportioning valves I've seen were either stuck from corrosion or leaky. I haven't seen any new ones. Adjusted, yes. Success is in the inner ear of the beholder. 140 ones might work. There are 2 different kinds, one for sedans and one for wagons, but they aren't adjustable and I'm not sure what the fittings are like. I'm using a Wilwood[adjustable] valve I got from my local speed shop for ~$70; I don't feel like it's optimum, but it's a lot better than nothing.


Re: Brake valve for 122?[ALL/1998] posted by paul mohney on
Sunday, 11 May 1997, at 1:57 p.m.

b/4 you go off into the woods please check all of your ususl stuff b/4 the really hard stuff like are the lines bled ,are the wheel cylinderso.k. are tge springs in good shape and put on right?

aback brakes are bendix(?) if not check to se if calipers are closing right in the front,

If the mater/cyl is o.k. the brake shoes are adjusted so the just touch in rear the wheel cylinders aren't leaking anywhere , if all the above art true then think( think ) abiut yiur porportioning valve. if so i believe a 140 should bolt up(ha ha ) and be adequate. if you cN THERE are people on the Amazon pages whose lives revolve around their 120's etc.check there and let me know what you decide

paul in santaana


Re: Brake valve for 122?[ALL/1998] posted by paul mohney on
Sunday, 11 May 1997, at 2:15 p.m.

b/4 you go off into the woods please check all of your ususl stuff b/4 the really hard stuff like are the lines bled ,are the wheel cylinderso.k. are tge springs in good shape and put on right?

aback brakes are bendix(?) if not check to se if calipers are closing right in the front,

If the mater/cyl is o.k. the brake shoes are adjusted so the just touch in rear the wheel cylinders aren't leaking anywhere , if all the above art true then think( think ) abiut yiur porportioning valve. if so i believe a 140 should bolt up(ha ha ) and be adequate. if you cN THERE are people on the Amazon pages whose lives revolve around their 120's etc.check there and let me know what you decide

paul in santaana


Re: Brake valve for 122?[ALL/1998] posted by Brian T. on
Sunday, 11 May 1997, at 9:55 p.m.

Paul is right that you should check for leakage from the rear wheel cyls. If that is okay, I would even consider removing the proportioning valve completely. My '65, which has no proportioning valve, has never had a problem with the rear wheels locking up (except when a rear wheel cyl was leaking), even in sudden stops. None of the 122s had them prior to '66. Unless someone else has actually done it, I'd be skeptical about using a proportioning valve from a 140, since the brake system is completely different (dual circuit and disc/disc). ---Brian




 


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