Question about 1991 Pontiac Grand Prix

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ABS master cylinder no longer available any where.

Any suggestions? Can I convert it to a standard brake system? What all would need to be changed? Has any one else addressed this problem.

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Go to rockauto.com they are pretty cheap.

Posted on Mar 11, 2009

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1 Answer

Abs brake system


Best case scenario bad vacuum pressure to the brake booster. Worst case bad abs control module or valve body/motor the abs system works by add and removing hydraulic pressure through valves and electric motor. Try using block off plugs at the master cylinder( remove lines plug outlets at master cylinder) check if brake pedal position and pressure is good(if there is no change problem is master cylinder or brake booster/ vacuum) if plugging at master cylinder solved issue repeat procedure at abs valve body after reinstalling lines from master cylinder if your problem returns your issue is in the abs valve body if plugging at the abs solves problem reconnect at the valve body bleed each line one by one testing between each line until you find the problem

Apr 11, 2014 | Hyundai Cars & Trucks

3 Answers

Abs brake problems


Its a sensor that needs changing, Even if the resistace is ok, dosent mean its pulsating and sending the correct signals.,, you already know the problem, the solution is you have to change the sensor.

Aug 01, 2008 | 1990 Buick Reatta

1 Answer

Santa fe 2001 abs and hand brake lights came on .what is the problem


It could be a problem with either system. The ABS uses the standard hydraulic brake system in addition to the ABS components.
You would need to get the ABS system checked out if the parking brake is off and the master cylinder is full of fluid.

Apr 12, 2013 | Cars & Trucks

2 Answers

Troubleshoot master cylinder on 1999 kia sportage


This is not a master cylinder problem, it an ABS hydraulic control sticking, the ABS in this is what we call "Active ABS", this means it can provide brake activation with bo driver pedal input. 1st have the system scanned for fault codes, if none are found I would be suspect of the ABS unit.

Jan 27, 2012 | 1999 Kia Sportage

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

4 Answers

I have an 06 jetta, 2.5l. does not have electronic parking brake. the brakes on all 4 wheel are dragging. you can open any bleeder and get a little squirt. wheels will spin freely. when you drive it again...


SOUND LIKE FAULTY ABS UNIT AND WHEEL SENSORS OR MASTER CYLINDER.THE MASTER CYLINDER PISTONS NOT RETURNING.RAISE THE REAR OF VECHICLE BLOCK FRONT WHEELS FROM MOVING.MAKE SURE PARKING BRAKE IS FULLY RELEASED SO YOUR BRAKE BRAKES NOT DRAGGING.THE BACK WHEELS SHOULD TURN WITH BRAKE RELEASED.IF NOT PARKING BRAKE NEEDS ADJUSTMENT.

Oct 29, 2010 | Volkswagen Jetta Cars & Trucks

1 Answer

ABS and loss of break pressure


Yes you can disable ABS. First, You said you loose brake pressure. Does your brake system have a vacuum booster and a master cylinder or is the master cylinder abs hydraulic assembly all built together?

Jun 07, 2009 | 1989 Jeep Cherokee

1 Answer

Replaced master cylinder bled as per specs but have dead pedal intermitantly. does this have to do with the abs system needing bled, if so how is that done.


Try changing the brake booster. The abs has nothin to do with the brake pedel. All the abs does is electronically adjust pressure applied to each wheel to keep the wheels from lockin up and sliding. You've either got a bad master cylinder or your brake booster is bad

Apr 30, 2009 | 1995 Honda Accord

1 Answer

Brake petal goes to the fioor once and well.


you have indeed changed almost everything.  and sadly many parts that you didn't need changing.  Could you have a bad hose at the wheels or a leaking caliper?  if all else fails I would start by blocking off one circuit of the braking system...with a plug, and checking for leaks in the active system and then switching sides.  Is the system being totally bled?  that means first at the master cylinder, then at the abs cluster and then each wheel...twice.

Mar 30, 2009 | 1997 Plymouth Breeze

3 Answers

Jeep Cherokee ABS light is on and now no brakes


Hi laustiin,
When the ABS system fails the brakes revert to standard brakes. The ABS module will not repair this for you.
The master cylinder is not likely to change anything either.
I am assuming that the pedal is full since you didn't say otherwise.
Your problem is most likely the brake booster. pump the brakes several times with the engine off to relieve any built up vacuum. While pressing down on the brake pedal start the engine. If the booster is working properly the pedal will move slightly down then press back against your foot. If it doesn't do this replace the booster.
If this doesn't help reply with more information and I will try to help you out.
Good Luck

Nov 03, 2008 | 1989 Jeep Cherokee

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