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Why would a '90 Geo Tracker's brakes fade after a long climb & come back full pedal a minute later?

Tiny
MACK
  • MEMBER
  • 1990 GEO TRACKER
  • 200,000 MILES
Checked fluid & looked for cracked vacuum hose.
Monday, April 30th, 2012 AT 3:23 PM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
When climbing, you would not be using the brakes, therefore it should not affect anything. Brakes fades when the fluids are not in good condition and repetitive use of the brakes causes the fluids to heat up resulting in brake fade.
With vehicle stationary, start engine and depress and hold the brake pedal. If it starts to sink after a few seconds, the brake master cylinder is leaking pressure internall and needs to be repaired or replaced.
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Monday, April 30th, 2012 AT 4:58 PM
Tiny
MACK
  • MEMBER
  • 15 POSTS
Appreciate the suggestion. Tried it. It didn't go down. I hadn't tried this one, this time, but am familiar w/ the concept & used in other situations. This one didn't feel as if it would work & didn't. While not a pro, I did qualify as a mechanic, for the Post Office & have many years under the hood & driving. This is the 1st time I have EVER encountered this & will have to find a solution, b-4 my wife experiences it. She'd panic & might wreck.
The ONLY time it does this is after a steep climb & gas is released. Then, if you press brake, it will floorboard. W/in 30 sec. To a minute, pressure is restored. Haven't tried pressing brake while STILL accelerating. That's next.
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Wednesday, May 2nd, 2012 AT 1:54 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Try bleeding the system to see if it works. There could be air in system.
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Wednesday, May 2nd, 2012 AT 3:43 PM

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