No Brakes

Joined
May 18, 2004
Messages
452
Location
Seattle, WA
I can push the pedal to the floor. Caught me by suprise they were working, got on the interstate, then needed to slow down and had nothing. I can pump them a bit and get some pressure, but right after release them and then push it back in I have nothing. What should I check first?
 
Joined
May 18, 2004
Messages
452
Location
Seattle, WA
Just an FYI, I don't think its related to the grinding of my calipers. I drove 400 miles this weekend, no issues. All day yesterday, nothing. Today, gone.
 

60wag

SILVER Star
Joined
Jun 25, 2003
Messages
1,924
Location
Boulder, CO
 
 
 
Booster problems usually cause a stiff pedal rather than a pedal going to the floor. I think your problem is a loss of fluid or a bad master cyl.
 
Joined
May 18, 2004
Messages
452
Location
Seattle, WA
The fluid is just below Max, which is where it has always been. Could it have been a random air bubble? When I start it in the driveway I have full pressure. I haven't tried to drive it again yet. I definatly won't bandaid the brakes.
 
Joined
Dec 7, 2004
Messages
490
Location
The Lou
It's the master. Mine did the same thing. It would have ok pressure at startup, but once I got rolling, no brakes.

I hypothesized that HEAT had something to do with it. I don't know what, I treid bleeding and all that to no avail. The only thing that fixed it was a new master.

Fred
 
Joined
Jul 13, 2003
Messages
4,633
 
 
 
I think it's correct that a bad booster makes for a stiff pedal. Since you have the opposite, it's not likely the booster.

That leaves either the MC or air in the lines...or water in the lines. Brake fluid is hydroscopic. (Aye hope eye speld that write?) It absorbs water, to prevent water bubbles. However it has a limit. If your fluid is old, enough heat will cause the increased water content to essentially boil. Boil = air = soft pedal.

Run a quart of brake fluid through the lines. That is, thoroughly flush out the old fluid. This will cost all of $8 or so. If that doesn't solve the problem, then the MC would be the next reasonable thing to replace.
 
Joined
May 18, 2004
Messages
452
Location
Seattle, WA
Ok, I drove it around this evening. No problems. I think flushing the brake fluid sounds like a fantastic idea. Where can I drain it?
 

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