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I have a triangular shaped master cylinder reservoir on my NON-ABS 1991 brick. When I shop online for a new one, they all point to the square style for 91 non ABS and the traingle shape for ABS. So does Vadis.
I know I have the OEM original from when I bought the car new. Both donor cars at the local P+P have squares too. Have I lost my mind..again..?
Is there a difference? Do I have to order the square box style?
--
420,000KM and still ticking
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Are you wanting to replace just the reservoir or the whole MC unit?
If the metal part in the PNP is the same as yours (though the reservoir is triangular) just pop off the square reservoir. Clean it out and switch it onto your MC.
On the other hand if you are looking to replace the whole MC, the PNP option would be my choice. Grab both (shouldn't be too expensive), disassemble them, clean them out and use them to build at least one good MC. And you'll have spare u-cup seals as back-up.
MCs are a simple yet effective setup. Disassembly is easy (literally pop open when remove rear triangle wire). Cleaning is easy. (I wash with dish detergent and water first, dry, then soak/store in with brake fluid to absorb water and prevent rusting. Methyl hydrate/alcohol is suggested but it evaporates like crazy.)
I have spares for free but you're a bit of a distance away.
--
1980 245 Canadian B21A with SU carb but electronic ignition and M46 trans in Brampton, Ont.
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posted by
someone claiming to be art
on
Sun Jul 13 10:43 CST 2008 [ RELATED]
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Hi,
I have the same situation, and discussed it before on the board. You're not losing your mind, there are three master types. You can't order the ABS version, because it has only one port. Yours, non-ABS has two ports for the redundant hydraulic configuration, but also has the reservoir float switch, taking place of the pressure balance switch in the distribution block.
The only non-Volvo-dealer solution I've seen is retaining your reservoir to use on the master that comes with the squared one. Bites.
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Interesting. I do see the square type at fcp does not have a float/swith and I do. I also checked and I do not have a differntial switch on my BJB.
Has anyone bought the Beck Arnsly rebuilt w/o reservoir from fcp? Seems like that might be my best route. I had my reservoir off to replace the grommets this morning so I know it will replace easy.
Thanks Art
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420,000KM and still ticking
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re: "...You can't order the ABS version, because it has only one port...."
The ABS master cylinder has two ports, not one. The green book (TP 31692/1, pg 12) states, "...As in other ABS models, the system is split into circuits by axle. In other words, the rear piston in the master cylinder serves the front axle and the front piston the rear axle."
Here are pictures of my own '93 240 (with ABS, of course):
and here's a closeup of my master cylinder, showing two ports:
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Hi Ken,
Oddly enough, you had to set me straight on this misconception once already, last year. Types of brake master cylinders on '91 model year and still I don't get it through my thick head. Sorry for being misleading.
Does that mean you can replace a non-ABS master with an ABS (read expensive) version? With just a little pipe bending? Are the step ratios the same, I wonder?
--
Art Benstein near Baltimore
Always read stuff that will make you look good if you die in the middle of it.
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Hi, Art.
I didn't know you ("claiming to be Art") were the same as Art Benstein. :-) I thought you were just some other Art.
re: "...Does that mean you can replace a non-ABS master with an ABS (read expensive) version?..."
I'm not sure how interchangeable they are, viz. "... with just a little pipe bending?..."
First, here are two photos, my 1984 (non-ABS) first:
Second, my 1993 again:
It would suggest that just a little pipe bending for the forward line is all that would be needed.
But I don't know how much the price differences are, and whether it's just inflation (date of manufacture)? The ABS reservoir would be more costly (it has the fluid level switch built-in to illuminate the dash warning light, instead of the pressure-comparison based switch of the junction box), but the reservoir shouldn't be included in the master-cylinder's box.
And I'm afraid I also don't know if there's any difference in the ratios -- although I don't think there would be any reason for it because the calipers' displacement volumes (i.e., piston area and stroke) aren't likely to be different than in a non-ABS car.
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Ken C and Art.
My 91 non-abs mc is different than both of the pics posted. I have the trainglular tank like the 93 ABS pic and an offset front pipe fitting with the non drilled port pointing straight like the 84 Non ABS pic. It physically looks a lot more like the 93 than the 84. Hopefully my pic posted.
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420,000KM and still ticking
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We have one like yours, and one like Ken's. 91 was a year in which both non- and ABS 240s were produced. I seem to recall reading the ABS was an option with a price tag to match, until 92, when all the cars had it.
The car we have that looks like Ken's I rarely see, and so forget how it is piped, but the one we have that looks like yours, I'm into quite often. The octopus, or distribution junction is without the pressure switch - just a simple dual manifold without any interconnection between the two systems.
--
Art Benstein near Baltimore
The main purpose of holding children's parties is to remind yourself that there are children more awful than your own.
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Your's is not the first I've heard like this.
I have a hunch (no proof) that Volvo started changing over the reservoir to the triangular kind with the built-in level switch even before they started incorporating the ABS system (in later '91), just to have the circuitry (for the dash warning light) already in place.
Tell me, since you don't have ABS ... do you also have the presssure-comparing switch in your junction box (the "octopus" under the fender)? I would guess, based on my hunch, that it's no longer there, even though you don't have ABS. In planning to introduce ABS, Volvo probably went with fluid level as the basis of warning (as in all later ABS 240s) instead of pressure difference in the two, separate, triangular circuits that you should still have in your '91, non-ABS, car.
I would be surprised if your dash warning light was activated by two things (fluid level *and* pressure difference) -- I expect onlyl either one or the other.
I'm curious, though, about your answer (the junction's switch). Looking forward to hearing from you.
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I do not have a differential switch on my junction box. No leaky seals to worry about for me.
Just one on the reservoir.
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420,000KM and still ticking
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"I do not have a differential switch on my junction box."
And yet your front calipers have two (2) fluid lines each? (non-ABS)
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Yes, we've discussed this in earlier messages on this thread. He's got a '91 with a configuration that appears to be "transitional" between the usual non-ABS car and the ABS cars.
He's got a non-ABS car with the two lines to each front caliper, representing the usual dual/triangular braking circuits. But he's also got the master cylinder reservoir of the ABS cars that has a fluid level switch built-in.
My theory has been that during this 1991 transition year, Volvo incorporated the fluid level switch to substitute for the junction box switch (pressure comparison switch) as the basis of the dashboard warning light, ahead of making ABS universal.
Read the earlier messages and see what you think.
Regards,
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Correct
2 fluid lines, 3 bleeders, Reservoir switch, No ABS, No BJB switch
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420,000KM and still ticking
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The only triangle shaped reservoir's i've seen have been on the abs cars.
Did you buy this car new?If you did'nt it could have been changed,as far
as I know 85 to 91 non abs used the square reservoir.
Dan
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I purchased this car new. It has never been changed.
Do the MC's function differently?
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420,000KM and still ticking
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