I have break fail on a Mazda Xedos. The ABS light is on but this was on prior to this.?
Answers:
Stuart W - Just out of curiosity, where on earth are you? You couldn't be in the US for sure since the Xedos was not exported to America. If you are in the states how did you get the car?
I know it very very well because as a business intern at Mazda HQ in Hiroshima back in December 1991 I was tasked with copywriting the catalogue, product guide book, marketing and sales guide book, the owners manual and workshop manual. And you won't believe this but I was also the 'technical guide' for the touring car racing version we raced in Europe (Driver Patrick Watts UK) in '92 -'93. And I recall it being called the "weiredly named Xedos". A very balanced car I thought it was and can run superbly on mag wheels. It ran neck to neck with the Merc, Alfa Romeo, Vauxhaul and BMW. Yes what a car indeed. We still have a number running on the roads of Hiroshima - and most owned by Mazda employees.
Production ceased very soon after launch because the company ran into serious financial problems - then Ford stepped in. There was nothing wrong with the vehicle, it is perhaps the best car Mazda built over the past twenty years. I really wish you can get it fixed. One last thing, when we launched it, the Toyota marketing guys were repeatedly quoted saying, "if our guys had built this car we'd sell half a million in the first year." and they were talking to Toyota dealers who'd complained to Toyota about their drab stlying.
All the best to you sir. P.S. The paint is rotation baked five coats. I believe it was the finest paint job on Japanese cars at the time.
While the ABS is certainly part of the brake system, it sits there doing virtually nothing until you hit the brakes hard enough to skid the tires. When one tire starts to skid, a computer sensing tire rotation redirects brake fluid away from the skidding tire. This actually decreases the brake fluid pressure to that one wheel. Of course, under heavy braking, it is sensing similar problems with all four wheels and pulses the brake fluid to all four to keep them turning instead of skidding.
Unless you are braking heavily enough to cause your problems, the ABS system isn't even functioning yet.
Brake "fade" and brake "failure" are two different problems. Fade being the loss of braking action under full pressure applied by the master cylinder to the caliper piston. Heat generated by the brake pad contact with the rotor causes the brake pad to produce a gas (called offgassing). This gas has no place to go and actually cushions the brake pad from the rotor. Even though full pressure is being applied, the gas has no friction value and braking action decreases or fades. Releasing the brake allows the gas to escape and braking action returns.
A brake failure on the other hand, generally means the master cylinder has failed and you will feel the brake pedal squeeze all the way to the floor. Most cars have power boosters so you may feel this pedal movement from high up on the pedal travel. If the booster failed, the brake pedal will travel through the travel of the booster and then come into direct contact with the master cylinder to apply the brakes. A bit unnerving but not a total loss of the brakes.
With a master cylinder failure, the power booster or the brake pedal as the case may be, have nothing to work with and the brakes do not get applied. With or without ABS, with no master cylinder, you simply do not have brakes.
Brake fade when the engine is started. the only thing the engine does is provide vacuum to the power brake booster. Sounds like the booster might be bad on your car. be sure you actually do still have brakes by pushing the pedal through the normal travel and see if you finally do have brakes even though they are hard to apply. They would feel hard because you are making the pressure in the master cylinder using your foot instead of the power booster.
Any reputable repair shop should be able to diagnose this problem with ease.
Good luck!
Try applying the brakes evenly, in a slow pace. Try to apply the brakes with force. Check if there's any vibration when you apply the brakes in any of these manners. If vibration occurs when you apply the brakes evenly and in a slow pace, you can try to bleed the brakes again. If vibration recurs, ask your mechanic to check the ABS. There might be something wrong with any of the sensors. Have the sensors cleaned or replaced, if necessary.
Good luck!
Came across this on v w,the seals inside the master cylinder are bypassing fluid internally more noticable with engine started due to servo assist. Change master cylinder to solve.
sounds like you need to have the brakes bleed properly.Why not get someone who knows what there doing to repair your brakes ?
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