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billrath14 02-23-2011 10:54 PM

peddle slowly drops
I have a 92 150. When I put the brakes on I got good peddle but if I sit with my foot on it, it will slowly drop down, The "anti lock " light will come on also. I have put a rebuilt master cylinder on along with a new power booster, new pads and shoes. I have also purged the lines. both of the problems may not be connected because the antilock light comes on when I start the truck then goes out. And some times it will stay off when I brake then let off befor the peddle drops very far.
Thanks in-advance Bill

RamTech 02-24-2011 08:42 AM

My first suspicion would be the master cylinder.

billrath14 03-30-2011 09:53 PM

replaced the master cylinder and bleed the brakes 3 times. The problem is still there. The peddle has 4 inches of travel before it starts slowing down the truck. it also fells mushy under "hard" braking, I can not get this truck to stop fast like it should.

erm 03-31-2011 04:54 PM

There's still a pressure problem and I'd suspect one of the slave cylinders on the wheels aren't working. They corrode and/or the caps and plungers aren't moving properly.

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