loosing brake pedal
#16
08-29-2007, 10:13 PM
Originally Posted by lmnr0026
Just out of curiosity, are there rebuild kits for these master cylinders or is replacement the only or for some reason best option? I'm a fix it kind of guy where possible and inquiring minds like to know... my new-to-me truck ('89 e350 7.3) does have some fade as well, but it's not too bad yet. brakes work fine under normal operation but but do fade to the floor in about 60 seconds of steady heavy pressure.
Any tips from those who have gone before me? Have done motorcycle m/c rebuilds several times but this is obviously a different beast.
Hope your brakes are sorted easy Bill!
Any tips from those who have gone before me? Have done motorcycle m/c rebuilds several times but this is obviously a different beast.
Hope your brakes are sorted easy Bill!
beware that trucks equipped with hydroboost it is normal for the pedal to go to the floor with heavy constant pressure
#17
08-30-2007, 06:24 AM
Originally Posted by tjc transport
my truck started life as a F250, but over the past 19 years everything in the suspension has been changed to the superduty suspension, except for the brake master, which i changed 4 months ago.
it originally had the 1 1/8 piston master cylinder. i upgraded to the F450 master,that unit has a 1 5/8 piston.
a word of advice though. you need to modify the mount to make the master fit in the 350/350.
it originally had the 1 1/8 piston master cylinder. i upgraded to the F450 master,that unit has a 1 5/8 piston.
a word of advice though. you need to modify the mount to make the master fit in the 350/350.
Unfortunately, nobody had this part in stock. I had to get the normal 1-1/8th master.
Brakes are good now.
#18
08-30-2007, 06:47 PM
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#19
08-31-2007, 06:33 AM
Okay, now I'm really stumped...
New Master cylinder.
New rear cylinders, shoes, and hardware.
New front calipers.
The brakes still drop if I stand on them.
What gives?
I'm going to crank the self adjusters later on, but I've got a cross country road trip, loaded with a Chevy 1500 4x4 truck and a 200lb flatbed trailer to do tonight.
New Master cylinder.
New rear cylinders, shoes, and hardware.
New front calipers.
The brakes still drop if I stand on them.
What gives?
I'm going to crank the self adjusters later on, but I've got a cross country road trip, loaded with a Chevy 1500 4x4 truck and a 200lb flatbed trailer to do tonight.
#20
08-31-2007, 11:57 AM
#21
08-31-2007, 01:16 PM
Originally Posted by schlager
Pele
Does your truck have RABS? Sometimes the RABS piston will stick so they tell me and cause a problem like yours. I don't have RABS on my 84 E-350 so I have never had this problem. There is a thread about this somewhere.
Does your truck have RABS? Sometimes the RABS piston will stick so they tell me and cause a problem like yours. I don't have RABS on my 84 E-350 so I have never had this problem. There is a thread about this somewhere.
Or just replace the ABS valve/pump/motor...
At least the thing stops.
#23
09-02-2007, 09:26 AM
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Hi Guys,
I am having the exact problem described in this thread. there is another thread that has alot of good info especially a TSB that deals with this problem:
here is the thread :
https://www.ford-trucks.com/forums/5...ow+brake+pedal
if that doesn't take you to the thread, then do a search on this forum on "low brake pedal"
hope this helps
Rick
I am having the exact problem described in this thread. there is another thread that has alot of good info especially a TSB that deals with this problem:
here is the thread :
https://www.ford-trucks.com/forums/5...ow+brake+pedal
if that doesn't take you to the thread, then do a search on this forum on "low brake pedal"
hope this helps
Rick
#24
09-02-2007, 10:05 PM
sinking brake pedal
That heavy pedal pressure is not normal brake application, Ford states... a sinking pedal is considered a normal reaction to heavy foot pressure after a stop.
Last edited by PLC7.3; 09-02-2007 at 10:08 PM.
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