Brake Pressure Problem
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Senior User
Joined: Dec 2004
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Brake Pressure Problem
92 F150, 351W, 4x4, Auto, A/C, etc
A month or so ago I had the rotors, calipers and pads replaced on both sides of the front. They inspected the rear and said the last person to put the shoes on put them on upside down, so they turned them around and wanted to see the truck in 500 miles to make sure they were doing OK.
After all that work the brakes were great, press the pedal about an inch and the brakes grabbed and stopped the truck.
Quite suddenly, over the last couple of days, I have been noticing the brake pedal is spongy. Doesn't happen every time I press the pedal, maybe one out of every 10 times I press the pedal it will go to the floor before I can get the brakes to grab enough to stop the truck.
Any ideas about this one?
Joe.
A month or so ago I had the rotors, calipers and pads replaced on both sides of the front. They inspected the rear and said the last person to put the shoes on put them on upside down, so they turned them around and wanted to see the truck in 500 miles to make sure they were doing OK.
After all that work the brakes were great, press the pedal about an inch and the brakes grabbed and stopped the truck.
Quite suddenly, over the last couple of days, I have been noticing the brake pedal is spongy. Doesn't happen every time I press the pedal, maybe one out of every 10 times I press the pedal it will go to the floor before I can get the brakes to grab enough to stop the truck.
Any ideas about this one?
Joe.
Senior User
Joined: Jun 2005
Posts: 187
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From: Bloomington Indiana
for a two day period my truck leaked fluid and was probably losing vacuum while doing it, now it wasnt that bad, but it took it about halfway to do anything, just make sure you have plenty of fluid and if worse comes to worst you still have the emergency brake 
Posting Guru
Joined: Sep 2002
Posts: 2,420
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From: Langhorne, PA
Allright, you need to inspect all 4 brake cylinders and rubber coated lines attached to each cylinder for leakage. During the repair the technician may have left something too loose on the front, and possibly could have instigated a rear cylinder to fail, simply because they were handling an old cylinder that was ready to start leaking. My 92 (170,000miles) still has the original front disc calipers and pistons, but my rear brake cylinders started leaking a long time ago. Look for leaks all the way back to the hard lines, and if that isn't the problem check all the brake lines, and re-bleed them.
I would probably take the truck back and ask the repair shop to fix the leak for free. They may have done a good job, and it is possible your master is failing. I would get the problem looked at immediately..no sense in crashing a classic.
I would probably take the truck back and ask the repair shop to fix the leak for free. They may have done a good job, and it is possible your master is failing. I would get the problem looked at immediately..no sense in crashing a classic.
