Cant Stop!
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New User
Joined: Sep 2012
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Cant Stop!
Hey all, I have a 1990 F250 7.5ltr 460. My brakes were a little spongey so I bled them and they stiffened up. this morning on the way to work I couldn't stop without using the emergency brake. All fluid levels are fine. any ideas?
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
First thing comes to mind is master is blown 0 ring/s internally. However that's working on assumption pedal goes to floor very little resistance or none, reason had to resort to E brake.
Remove both lines from the master block ports, solid plug them so as no pressure can pass.
Solid pedal?
If not pedal goes to floor? problem very likely in the master itself, replace it following included instructions to the letter to "bench bleed" before installing on truck.
Pedal solid, problem is down stream.
Blown rubber line, budges out but doesn't leak.
Cracked/flexing caliper or rotor cooling fins rotted out, crushed (you'd likely felt that).
Possible problem in the RABS unit.
Remove both lines from the master block ports, solid plug them so as no pressure can pass.
Solid pedal?
If not pedal goes to floor? problem very likely in the master itself, replace it following included instructions to the letter to "bench bleed" before installing on truck.
Pedal solid, problem is down stream.
Blown rubber line, budges out but doesn't leak.
Cracked/flexing caliper or rotor cooling fins rotted out, crushed (you'd likely felt that).
Possible problem in the RABS unit.
Thread Starter
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New User
Joined: Sep 2012
Posts: 3
Likes: 0
I will check it! This morning it had no pedal at all so yes that was the reason for e-brake. It is tight prior to starting but once engine is running it goes to the floor with no resistance. the master was replaced about a year ago by the guy i bought the truck from.
Thank You.
Thank You.
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