Suspension, Brakes and Tires Discussion, 76 mushy brakes, help? in Item Specific Cadillac Discussion; i have a 1976 hease, based on the 76 fleetwood (500ci). Recently when i brake i can allmost put my ...
Automobile(s): 2015 Mazda3 S GT Hatchback 2013 Kia Optima SXL
Re: 76 mushy brakes, help?
Do not just bleed the brakes. Replace all of the old fluid. Bleeding only removes some of the old fluid. The funny thing about brake fluid, it absorbs moisture. That turns it into a sloppy mess. Replace all of the fluid, and go from there. If is is still mushhy, it may be a bad brake line. The rubber gets old, and will expand when braking, which is not good. These are your two main areas to attack first.
No, it's DEFINATLY NOT a power booster problem. A power booster problem would do the exact opposite of the problem he's describing. If it was a power booster problem, the pedal would be very firm but you will have very little stopping power.
Pumping the brakes will NOT restore firmness to the petal if there is air in the line. Pumping the brakes releases the vacuum from the booster so it may get a little more firm, but not much.
It could be (in no particular order):
1. a master cylender problem
2. a bad proportioning valve
3. air in the line
4. a leak
5. old rubber brake lines
6. internal leak in a caliper
7. bad cylender in one of the rear drums <-definatly check for this one
8. poorly adjusted rear drums
I think thats all of them...
EDIT: Yeah I forgot one... It could also be the metering valve.
ANOTHER EDIT: It is good to flush out all the brake fluid once in a while like Dadillac said. This prevents the lines from rusting on the inside. Although, water is a liquid, and liquids can't be compressed. Therefore, diry brake fluid will not soften your petal. It may however reduce the life of your brake system, and could cause this problem in that respect.
will do, i may have overheated my brakes, the hearse probably weighs 6000lbs and i carry about 1500lbs of equipment with it, if your currious you can see it on my webpage www.airportcircle.com click on the word "hearse"