| Author | Message | ||
     Matthew A. Collmann (Bubba) New Member Username: Bubba Post Number: 3 Registered: 08-2003 |
Just replaced the front pads on my 96 D1. Backs looked ok, fronts needed replaced. After replacing I'm still having to one pump the brake pedal to get it to stop. This is probably something other than pads, right? thanks for your help | ||
| Chris Browne (Chris_browne) Senior Member Username: Chris_browne Post Number: 338 Registered: 02-2003 |
Have you been losing brake fluid recently? | ||
| Bill Ross (Billr) Member Username: Billr Post Number: 101 Registered: 11-2002 |
If you are having to pump the brakes but are pumping up to a firm pedal, then you have air in the lines. But some other things that could be happening are that the rotors are glazed or, and this happen to me although its a bit different, your wheel bearing(s) need adjusting. That is, you are getting enough wobble in the hub to allow the rotor to be forcing the pads back in the caliper. You apply the brake and get an initial play to take up the slack then a firm pedal. There should be other signs of a loose bearing, but in my '94 Disco it was this weird brake thing that took me a bit to figure out. Anyway, hope this helps. | ||
| ken nishikawa (Scubaman99) Member Username: Scubaman99 Post Number: 95 Registered: 06-2002 |
did you bleed the brakes when you changed the pads??? | ||
| p (Pfb) Member Username: Pfb Post Number: 62 Registered: 08-2003 |
Air in your brake fluid is a bad thing, as air is compressible (pump, pump, pump) and fluid is not. Air gets in the line when the fluid boils, or if you have a leak. Fluid boils from heat at the pad/rotor transfering to the piston. Worn pads boil fluid more easily, as there is less insulation between the rotor and the piston. Water gets in the brake fluid as well, often from condensation, significantly lowering the boiling temp of the fluid as well as causing corrosion in the system. I always find it amazing that folks are indoctrinated into changing oil every 3,000 miles, but will leave factory brake fluid in a vehicle for 100,000... Not smart. At a minimum, bleed the brakes. It's only a little bit more work to completey purge the old fluid and refill with a quality fluid like Valvoline LMA. | ||
| Luis Constantin (Luisc) Member Username: Luisc Post Number: 157 Registered: 02-2003 |
Make sure your brake fluid is approved for use in ABS systems. The fast pumping effect of the ABS can aerate the brake fluid sending bubbles through the line. Example; DOT5 fluid for use in motorcycles has a higher temp rating which sounds fine and dandy. The trade off is it absorbs air more easily. | ||
| Tbow (Tbow) Member Username: Tbow Post Number: 147 Registered: 12-2002 |
Check your master cylinder. Does the brake pedal slowly go to the floor when you hold down on the brake pedal. If it does, then the master cylinder is leaking internally between the front and rear pistons. Also, did you crack open the bleed screw when you put on the front brake pads?? It wouldn't hurt the bleed the brakes to check for air. | ||
| Matthew A. Collmann (Bubba) New Member Username: Bubba Post Number: 4 Registered: 08-2003 |
I have not noticed loosing any brake fluid. I did not bleed the lines when I changed the pads. I think I will try bleeding the lines first. On the wobble in the hub, I haven't notices anything there. As usual thanks for the advice. Ok, for another rookie question, any links to bleeding procedures. thanks, Matt | ||
| Garrett (Rover7592) Senior Member Username: Rover7592 Post Number: 326 Registered: 03-2003 |
i had that same problem, i changed the pads and everything and wasted a lot of money, come to find out that the master cylinder was shot. Replaced the master cylinder and it worked, but the whole car vibrates when i hit the brakes like a warped rotor or something, and my brothers did the same thing. | ||
| Matthew A. Collmann (Bubba) New Member Username: Bubba Post Number: 5 Registered: 08-2003 |
Did you replace the master cylinder yourself? Also, on the warped rotor. Do you know what it takes to remove the rotors for turning? I have a little bit of warp to mine. Need to take up to Midas and get them turned. | ||
| Matthew A. Collmann (Bubba) New Member Username: Bubba Post Number: 6 Registered: 08-2003 |
I tried the brake bleeding. Started on the passenger rear, had my wife pump the pedal, saw several air bubbles in the line. That was the only one I saw air bubbles. Completed the job, got in and presto, no more pumping the brakes. thanks to everyone for their input. Matt |
