Question about 1997 Chevrolet Blazer

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Where can I find a brake proportioning valve for my 97 S-10?

I want to bypass the ABS. The ABS/proportioning valve is fed by 2 lines from the master Cyl. and 3 lines going out (2 to the front calipers brakes and 1 to the rear)

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  • dewdrops May 22, 2009

    The ABS/proportioning valve will not pressurize the rear brake Cyl. The garage tells me the ABS needs to be replaced. The system on this blazer should have been recalled. I've owned it for 7 Yrs. and it sucks. I am a retired mechanic. Besides myself, I've had 2 other active mechanics confirmed that this system never performed as expected.

  • Anonymous Mar 19, 2014

    Replaced master cyl and abs pump, no pressure in one front and one rear line

  • Anonymous Mar 19, 2014

    Replaced master cyl and abs pump, no pressure to 1 front and 1 rear lines, pedal goes all the way down

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When people tell me they hate there ABS, alot of people who pull trailer do. I tell them just to pull the fuse this will stop them completely. Yeah theres a light ont he dash but that can alos be delt with by removing the bulb for it. But int he long run just pulling the fuse is quick and Free.

Posted on May 17, 2009

  • James Huber
    James Huber May 21, 2009

    Im sorry maybe i didnt understand the question

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The front drivers side break keeps locking. I have replaced the caliper and now when I pump it no fluid is coming out from the line.


Did air get into the master cylinder? If you can, try bleeding the master cylinder. The fact that you aren't getting any fluid out of the line suggests that the master cylinder isn't pumping fluid.

Master cylinders are (usually) on a split circuit system - that is, the front left brake is on the same line as the rear right. The front right brake is on the same circuit as the rear left.

A point to be aware of is when bleeding brakes/doing brake work and if the master cylinder runs dry, is that a seal inside the master cylinder can fail/twist over and not pressurise that particular line, even though it may pressurise the opposite brake line.

I'm in the UK. I have a 1998 Jeep Grand Cherokee 4 litre, which I am slowly rebuilding. Three weeks ago I fitted new front brake rotors, new front callipers and pads. I've been rebuilding cars for over 40 years now and have done countless brake overhauls.

.. and could I get a hard pedal after the job was completed? I must have bled the brakes three times a day for a week and couldn't get a brake pedal. I phoned a full time mechanic I know - he came and tried to bleed the brakes three times and couldn't get a hard pedal.

That's when you think 'The master cylinder was working before I started the job so it must be still working now'.

I fitted a brand new master cylinder and because some parts for older jeeps are hard to come by in the UK, I fitted a second hand proportioning valve. When I bled the brakes again the pedal became rock solid. Fixed.

You're probably fed up with your braking problem now ... and apparently this 'no fluid/brake pedal' is more common than you may think.

Try bleeding the master cylinder if you can. If you suspect that it isn't fully working - try an overhaul kit which is cheaper than a new master cylinder.

As for changing the proportioning valve .. that's your decision. My brakes now work though the truth is I don't actually know which was at fault as I changed both the master cylinder and proportioning valve at the same time. Maybe both were at fault, for whatever reason. I genuinely don't know.

The positive aspect is that you are doing your own work and know what you're doing. You're saving on labour charges.

Apr 18, 2016 | 1998 Dodge Grand Caravan

3 Answers

Have a 1993 dodge Caravan SE. Purchased it from a man which converted it from ABS to hydraulics. I didn't know it had brake problems till i got it running. He put on a 3 outlet 2 inlet proportional...


if something goes wrong with abs the brake system it reverts back to standard system!! If you can pump brake pedal up and hold it and start engine and it drops thats normal.You say low pedal if you go 15mph on road and check where pedal is when brakes apply.Power brakes will push aLMost to floor while stopped but while moveing you`ll almost go to slide or will go into slide if pedal is pushed to floor.Get on some gravel at 10 mph and hit brakes to a complete stop get out and check to see if all 4 tires slid or 2 front or only 2 rear. this will get you closer to problem good luck.

Jul 12, 2011 | 1993 Dodge Caravan

1 Answer

How to bypass abs systemon a 94 jeep 4 will drive


If the ABS isn't working the "fail safe" mode is supposed to revert back to regular brakes, but the light on the dash will remain on.
Your other option is to go to a scrapyard and find a vehicle like yours without ABS and map out where the lines are attached at both ends.
You will need the power booster, master cylinder, brass "t" block at the rear differential and proportioning valve from that vehicle, You may be able to re-use some existing brake lines from yours but best to just buy new. When replacing a line you may need several sections. Joining them should be done with solid unions not compression fittings. It is not necessary to exactly follow the original ones as long as you are reasonably close and keep lines off of sharp edges, moving suspension components and exhaust pipes. Before you even begin to do anything on your vehicle be sure the bleed valves are not frozen so when you are finished you will be able to bleed out the system and, have at least a quart of new brake fluid on hand to do that with..

Aug 24, 2010 | Jeep Cherokee Cars & Trucks

1 Answer

Brake fluid does not flow to back wheels. I replaced lines


bleed master cyl ,abs, and check proportioning valve, proportioning valve if stuck will stop flow to back etc

Jul 25, 2010 | 1994 Buick Roadmaster

1 Answer

Driver side brake not bleeding properly after bleeding left side and changing rotors, calipers, and pads?


first of all make sure master cylinder is full of brake fluid.then you crank car leave foot off brake pedal. watch abs light on dash it should turn off in 10 seconds if not have car towed to garage or dealer. they have to use a scanner to scan the abs brakes if abs light turn off in 3 seconds. then starting bleeding from master bleed the lower brake line fitting at the proportional valve followed by the upper brake line fitting. keep eye on brake fluid in mastercylinder dont let run dry.next prime the abs hydralic modulator.connect the bleeder hose to the rear bleeder valve on the modulator.place the other end into a container partially filled with cleab brake fluid.make sure the end of the hose is submerged.open the bleeder valve slowly about 1/2 to 3/4 turn have an assistant depress the brake pedal and hold it in the depressed position. when the flow of fluid ceases close the bleeder valve.repeat process until no air bubbles are present in the fluid.then tighten the bleed valve securely. start bleeding brakes. your bleeding sequence is right rear - left front - left rear - right front.WARNING IF ALL FAILS YOUR BRAKES DONT FEEL SOLID AND FEEL VERY SPONGY.DONT DRIVE CAR. HAVE IT TOWED TO DEALERSHIP.THEY WILL HAVE TO PRESSURE BLEED YOUR BRAKE SYSTEM.

Nov 17, 2009 | 1999 Oldsmobile Alero

1 Answer

Very little (almost nonexistent) rear brakes. Cannot stop rear wheels even with wheels off the ground. Replaced MC, wheel cyl.,Rubber hose, booster, proportioning valve, bypassed rear ABS, shoes, drums,...


What happens when you try to bleed the rear brakes? If nothing comes out, trace each line back toward the proportioning valve--something would be blocking flow of fluid. Disconnect each line at the forward end and see if fluid comes out of the valve openings. You will need a scan tool to complete the bleeding process with ABS. Suggest buying a Chilton's manual for this truck because of the complexity of the ABS system.

Sep 30, 2009 | 1997 Dodge Dakota

3 Answers

No brake pressure


should not need to bleed module try giving the proportion valve afew good smacks sometimes this will dislodge the valve then rebleed

Jun 03, 2009 | 1998 GMC Jimmy

1 Answer

The ABS/proportioning valve is not working.


these trucks need a seperate bleed procedure for ABS you need a scanner to put it into this bleed mode,hope this helps if not get back to me and we'll go from there. please rate my fix as i strive to be the best

May 19, 2009 | 1997 Chevrolet Blazer

2 Answers

Fading brake pedal


Perfect well at this point i would say that tha abs valve is bypassing fluid. If you can un hook the line that comes into the abs valve and plug it and try and bleed the system where you cap the line going into the abs valve. If you get a good pedal after pluging the line going into the abs valve this tells me that the abs valve is bypassing fluid give it a try i have ran into this a few time and the abs valve has been bad. Also can you rate this sluton also i do hits on my own free time thanks good luck

Jan 16, 2009 | 1995 Ford F350

1 Answer

1998 bravada brake problem


If you have not replaced any brake lines or brake calipers, then It sounds like that the brake proportioning valve or the brake master cylinder if defective. If the the brake pedal goes to the floor, the master cylinder is at fault. If not, the proportion valve, which is part of the ABS valve body is defective. Have your local garage check these two components for possible problems.

Jan 11, 2009 | 1998 Oldsmobile Bravada

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