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Pontiac brakes repair questions and answers

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  • AutoMD Member
    AutoMD Member - 2006 Pontiac Grand Prix - Brakes - 7/20/2014
    Rust in brake housing
    Mileage $84,000 brakes replaced 3 months ago Is there anything I can use to get rid of the rust that will not impact the brakes themselfs?
    • Jimm
      7/20/2014 Jimm
      Need more information - where exactly is the rust or corrosion in question? On which specific brake part or component is the rust noted?
  • AutoMD Member
    AutoMD Member - 1995 Pontiac Grand Prix - Brakes - 7/4/2014
    Need help with 95 Pontiac Grand Prix gtp ABS/brakes problem. Leaking fluid and not full use of brakes.
    I own a 1995 Pontiac Grand Prix GTP with the 3.4L DOHC. Since I have owned the car, I have not had ABS which is not a problem for me. But i recently changed my back brakes and within a few days was leaking brake fluid from under the ABS Hydrolic Unit. The back ...
    • Jimm
      7/4/2014 Jimm
      No ABS may be related to severai possibilities; dirty/faulty sensors, wiring or connection issues, ABS control module, ABS relay or fuse. Have the ABS system scanned for any stored fault codes as one first step.
      7/4/2014 AutoMD Member
      Jimm, its not the ABS that Im worried about. I can deal with that, have had none the 3 years I have owned the car. What Im trying to figure out is after I changed my back brakes, why and where exactly did it start leaking fluid from around the ABS and cause my back brakes to not fully function. Im sure the extra pressure from the changing of the back brakes cause something to fail, Im just hoping it was something like a gasket, etc. and not something major like the ABS hydrolic unit itself.
  • AutoMD Member
    AutoMD Member - 2006 Pontiac Grand Prix - Brakes - 6/10/2014
    Brake fluid not reaching brake fluid level sensor in reservoir
    The dash says my brake fluid is low. I check the resevoir and it's full. I replace the sensor and it's dry. Seems as if only half of the resevoir is filling but I don't see an obvious problem why.
    0 answer
  • AutoMD Member
    AutoMD Member - 2006 Pontiac Grand Prix - Brakes - 6/10/2014
    Brake fluid not reaching sensor in brake fluid resevoir
    The dash says my brake fluid is low. I check the resevoir and it's full. I replace the sensor and it's dry. Seems as if only half of the resevoir is filling but I don't see an obvious problem why.
    0 answer
  • AutoMD Member
    AutoMD Member - 2004 Pontiac Grand Prix - Brakes - 5/20/2014
    When I brake it feels like the brakes are thumping, what is this?
    I just had my brake pads replaced and the problem got worse
    • Jimm
      5/20/2014 Jimm
      Several possibilities; faulty front brake caliper hardware / bolts, faulty / warped front brake rotors.

      The parts are readily available from these many on-line sources,,,,, - to list only a few possibilities. The various front brake rotors are listed in price from around $20.00 each - from RockAuto.
  • AutoMD Member
    AutoMD Member - 2004 Pontiac Grand Prix - Brakes - 3/16/2014
    How to find a brake fluid leak? Is there something a mechanic can do to make it easier to find it.
    I have had to add about 4 ounces of brake fluid 3 weeks after filling resorvoir to maximum. I looked around reservoir and placed newspaper by wheels and could not find. Any suggestions on how to find or where else to look for the leak?
    • Affordable Auto Service
      Check for fluid under master cylinder where it meets vacuum booster, also check under dash where brake pedal comes through firewall. If you have drum brakes remove wheels and brake drums and check for leakage at wheel cylinders. finally a visual check under vehicle along all brake lines.
  • AutoMD Member
    AutoMD Member - 2004 Pontiac Grand Prix - Brakes - 3/15/2014
    How to find a brake fluid leak. Do mechanics how something to help find it
    I've looked for leak around resorvoir, and master cylinder and place newspapers at backside of tires; and cannot find leak (i've added about 4 ounces 3 weeks after topping off resorvoir. Any advice on how to find it and where else to look. Does a mechanic have a ...
    • HouseCallAuto
      3/15/2014 HouseCallAuto
      If there are no external leaks at the lines then you have to remove all tires and look at calipers and / or drum brake cylinders and also consider the rear of the master leaking into the brake booster.
      3/15/2014 HouseCallAuto
      By the way, an experienced mechanic would figure it out.
  • AutoMD Member
    AutoMD Member - 1980 Pontiac Firebird - Brakes - 3/13/2014
    Front driverside brake caliper locked up.--should I replace.
    I can free it up untill the next I apply the brakes.Will not let up by it self.
    • HouseCallAuto
      3/13/2014 HouseCallAuto
      It could be a bad brake hose on that side also. In this situation if you just want to know that this problem will be fixed same day no back and forth, just buy a brake hose and caliper for that side and if that solves it you should then do the same to the other side to keep things in balance.
  • jim
    jim - 1999 Pontiac Grand Am - Brakes - 2/22/2014
    How do i tell if its the master cylinder or the power booster thats bad on my 97gmc 1/2ton pickup
    My brake pedal suddenly went down 3/4 of the way to the floor but it stops
    • Jimm
      2/22/2014 Jimm
      Easy diagnosis. To determine the power vacuum booster condition / integrity - pull (remove) the booster vacuum line (hose) connection from the engine - or unplug the vacuum line at the end opposite the booster check valve connection.

      With the engine off - apply a vacuum to the booster through the hoas and check valve - using a handheld vacuum pump (MityVac or equivalent). The vacuum applied should hold - if it does not hold (reduction over several minutes), then the power booster diaphragm is faulty / ruptured.
      If the vacuum holds - no loss in vacuum over several minutes, then suspect the master cylinder.

      The parts are readily available from these many on-line sources,,,,, - to list only a few possibilities.
      In fact, they (RockAuto) list the power brake booster from around $64.70, and the brake master cylinder from around $54.00 for your vehicle.
  • AutoMD Member
    AutoMD Member - 2000 Pontiac Grand Prix - Brakes - 1/6/2014
    Abs light comes on at random
    light comes on , shut off and restart car and it turns off . no check engine light . happens while driving . once in a while .
    • HouseCallAuto
      1/6/2014 HouseCallAuto
      There is a fault code stored in the abs module that will tell important diagnostic info but requires a code reader capable of reading the codes. A tool like an Actron CP9580 or similar is needed. That tool is about $250 or you have to pay someone to read the codes for you. The auto stores cannot read abs codes for free like they do the engine codes. They don't even read the abs codes for a price. So, in short there is a malfunction in the abs system, maybe a front wheel speed sensor but info is needed to know. Not a safety issue though.
  • Moses
    Moses - 1998 Pontiac Firebird - Brakes - 12/28/2013
    What is causing front right brakes to lock up?
    I have replaced the caliper and the brake hose, and the brakes are still locking up.
    • Jimm
      12/28/2013 Jimm
      Check the opposite side caliper and brake hose - usually the brake hoses are replaced in pairs / sets.

      The parts are readily available; try these on-line sources;,,,, - to list only a few possibilities.
      In fact, they (RockAuto) list the replacement flexible brake hose from around $13.00 for your vehicle.
  • Moses
    Moses - 1998 Pontiac Firebird - Brakes - 12/26/2013
    What causes the caliper on passenger side to lock up?
    The brake caliper on passenger side locked up. I loosen the bleeder valve slightly and it started working.
  • wrjabs55
    wrjabs55 - 1994 Pontiac Sunrunner - Brakes - 12/25/2013
    Front brakes last about 4-5,000 km replaced twice already ,when tested front brakes lock up and release as normal
    Dealer has suggested replacing both front calipers and the master cylinder and the booster and also the front cost which exceeds the value of the vehicle, any suggestions
    • HouseCallAuto
      12/22/2013 HouseCallAuto
      Dealers have no heart, they suck so bad. Unbolt the master cylinder and install two washers in between the booster and master cyl and see if the brakes now last longer. Before you do this buy an infrared thermometer so you can quickly measure the temperature of the front wheels at different times. You can get one very cheap online, like $15 harbor freight. Then you can compare temperatures after installing the washers. if the washers are helping the temperature will go down. If the washers solve this then replace just the master cyl.
      12/22/2013 HouseCallAuto
      One washer under each ear of the master cyl.
    • bear.1216
      12/25/2013 bear.1216
      You did not mention how the rear brakes are functioning. Non- functional rear brakes will cause the front brakes to do all the stopping and will wear out very fast. If the fronts apply and release normally then you should make sure the rear does the same. Check for pressure to the rear brakes by bleeding the system. You should have good pressure to all wheels with a good stream out of eash bleeder screw. If you have no fluid flowing to the rear then suspect the master cylinder.
  • AutoMD Member
    AutoMD Member - 2001 Pontiac Grand Am - Brakes - 12/12/2013
    No brakes or pedal, serviceman stumped.
    ABS light was on so serviceman fixed, no light now. Now it doesnt have any brakes. Replaced calipers, Master Cylinder, bled all brake lines. No leaks. You can pump the brake and they will get hard but eventually the pedal goes back to the floor. Also didnt find a ...
    • Jimm
      12/12/2013 Jimm
      Most likely, the problem will be related to air in the master cylinder - was the master cylinder bled (while on the bench) completely before it was installed to the vehicle? If not, start here and fully bleed the brake master cylinder - as it will also contain an amount of residual air.

      Check the 'How-To-Guides' feature on the AutoMD website for the specific steps to bench bleed the brake master cylinder.

      The other possibility is a leak in the power brake booster - located just behind the brake master cylinder.
    • HouseCallAuto
      12/12/2013 HouseCallAuto
      Some cars if you put calipers on switched sides, an inexperienced mechanic could miss that and you will not achieve a brake pedal. Another strategy during this diagnostic phase is assuming that the loss of the brake pedal is being caused by an anomaly at ONE of the wheels. To try to uncover that anomaly, use a tiny vice-grip or other suitable tool and clamp off one brake hose at a time, after clamping the hose closed carefully now check the pedal and see what wheel improves the pedal after clamping it shut. The logic here being that if the brake cannot actuate on that wheel, it rules out the components at that wheel as a cause.
      12/12/2013 HouseCallAuto
      Or it rules it in as a cause....
  • tim
    tim - 2002 Pontiac Grand Prix - Brakes - 12/9/2013
    Getting an occasional amber abs warning light
    The light comes on for no apparent reason. driving at freeway speed or city driving may trigger. brake fluid level normal. No unusual pad or rotor wear.
    • HouseCallAuto
      3/21/2011 HouseCallAuto
      If you have interest in trying to diagnose this yourself, the first step is buying a code reader that is ABS capable. Then read the codes and then post the codes here and we can help. No codes, you cannot find the cause.
      3/21/2011 tim
      Will obtain code(s). Thanks.
    • Sammy
      12/9/2013 Sammy
      poss wheel speed sensor or wiring to that sensor compare ohms and a/c out put
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