Quote:
Originally Posted by longhorn986
Thanks everyone. Here is some more info:
- This is a 99 Spec Boxster race car with a completely stock brake system (with Performance Friction 06 pads)
- The brake fluid is only two race weekends old and is ProSpeed RS683 – premium racing brake fluid
- There are no leaks anywhere
- The pedal is nice and hard when the engine is off and does not move when constant pressure is applied
- The pedal softens when the engine is started (as seems to be expected) and the pedal does not move any further or go to the floor when constant pressure is applied
- While driving, a double-pump clearly creates more stopping power than a single pump
My primary suspicion is that I did not get all the air out when I bled the brakes, or maybe the fluid is contanimanted and needs to be fully flushed out. But I was curious if these symptoms could also indicate a possible master cylinder problem (or brake booster problem)?
|
NEW INFO - did not know under what condition you experienced this. most likely the brake fluid it boiling (or nearly)and yes you will get a better pedal on the second pump. I'm not familiar with prospeed but if the 683 is an indication of the boiling point them you should be OK . Having said all that, it is also possible the master cylinder is starting to go but if I remember right I had to pump mine more than twice to get a brake on the track. I would conside installing a new master cylinder ( cheap insurance)