85 F250 brake problem
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Tuned
Joined: Aug 2005
Posts: 305
Likes: 1
85 F250 brake problem
When I step on the brake pedal it is very hard. It feels like I have the brakes of a ten speed bike. I have replaced the master cyl, the power booster, the wheel cylinders, the calipers, the pads/shoes, had the rotors turned and still no resullts. The guy before me had shown me all types of recipts of the brake work he had done to it. So I thought I had a good brake system. Thats when I started replacing the components listed above. I have read about the brake lines swelling but I dont think it would make that big of a difference. What about the proportioning valve or the device on the rear axle that makes the brakes stronger as more weight is applied to the truck? I am at my witts end. Please help!
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Joined: Jun 2004
Posts: 1,635
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From: Niceville, FL.
If the pedal is all the way to the top you may have to adjust (shorten) the length of the pushrod between the booster and master cylinder piston. Instructions on how to adjust should have been included with both the replacement master cylinder and booster.
If the proportioning valve is off center you should be getting a red "Brake" warning light on the instrument panel in "Run" unless there is a bad bulb or the circuit has been disconnected. If the "Brake" warning comes on in "Start" the circuit should be ok.
On the rear axle the Short shoes should be toward the front of the truck and long shoes to the rear. If they're reversed you get very poor brakeing action and the pedal may feel harder than normal.
If the proportioning valve is off center you should be getting a red "Brake" warning light on the instrument panel in "Run" unless there is a bad bulb or the circuit has been disconnected. If the "Brake" warning comes on in "Start" the circuit should be ok.
On the rear axle the Short shoes should be toward the front of the truck and long shoes to the rear. If they're reversed you get very poor brakeing action and the pedal may feel harder than normal.
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