I recently rebuilt my calipers (a job I've done before), put in new pads, and did a brake fluid flush. I did this in part because it's a new track season, and also because I had a spongier brake than I was comfortable with. When I was done the brakes felt less grippy, so I bedded them in and got my grip back and stopping power back. But the variable sponge was still there.
After doing some research my conclusion was that if a gentle press of the brakes causes the brake pedal to drop significantly further than stabbing the brakes, that there was either a leak or the brake MC was bad. Since I track my car I watch my brake fluid level like a hawk. I also did a visual inspection and came up (literally) dry. Brake MC it must be!
So I replaced the brake MC, flushed the entire system again including the clutch, and....still spongy. If I stab it I still get a very different pedal feel and travel than if I ease into them. So what, after two flushes, and a new MC could cause this? Air in the lines? Note that I use a pressurized system to push the fluid through the lines. I feel confident I'm doing this as best I can, or at least as best as I've done the previous 10 brake bleed jobs and all of them were successful.
Here is the last tricky bit, and my current suspicion. I might have air in my ABS unit, but without functional ABS I can't force the unit to activate. Since it's a track and dry weather car with aspirations of being a Pro3 car, I'm tempted to just bypass the ABS unit all together and make my like simpler. It's never worked and I have no intentions of spending the time/money to make it work.
Thoughts? Other suggestions? Anyone had this before? Maybe I'll post a video demonstrating the difference in the pedal.
After doing some research my conclusion was that if a gentle press of the brakes causes the brake pedal to drop significantly further than stabbing the brakes, that there was either a leak or the brake MC was bad. Since I track my car I watch my brake fluid level like a hawk. I also did a visual inspection and came up (literally) dry. Brake MC it must be!
So I replaced the brake MC, flushed the entire system again including the clutch, and....still spongy. If I stab it I still get a very different pedal feel and travel than if I ease into them. So what, after two flushes, and a new MC could cause this? Air in the lines? Note that I use a pressurized system to push the fluid through the lines. I feel confident I'm doing this as best I can, or at least as best as I've done the previous 10 brake bleed jobs and all of them were successful.
Here is the last tricky bit, and my current suspicion. I might have air in my ABS unit, but without functional ABS I can't force the unit to activate. Since it's a track and dry weather car with aspirations of being a Pro3 car, I'm tempted to just bypass the ABS unit all together and make my like simpler. It's never worked and I have no intentions of spending the time/money to make it work.
Thoughts? Other suggestions? Anyone had this before? Maybe I'll post a video demonstrating the difference in the pedal.
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