Brake Proportioning Valve
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Fleet Mechanic
Joined: Sep 2005
Posts: 1,509
Likes: 3
From: Ladner, British Columbia
Originally Posted by Ben-jamin
glad you have the problem in hand and i like that you opted for the better shoes and pads. i've had alot of rear brake issues with these fords, even 1/2 tons. found that alot had to do with NOT turning the rear drums or at least checking them to make sure they are not out of round, then scuff 'em up real good to help take the glaze off so they will brake-in better and last longer.
i read a break-in procedure from Bendix - 30 stops from 30mph with 30 sec. cooldown interval-works great.
something else i've run into is putting duelly wheel cylinders on a single wheel truck really increases apply pressure and increased lock-up
also contamination makes them want to lock especially when cold.
i read a break-in procedure from Bendix - 30 stops from 30mph with 30 sec. cooldown interval-works great.
something else i've run into is putting duelly wheel cylinders on a single wheel truck really increases apply pressure and increased lock-up
also contamination makes them want to lock especially when cold.
You covered a lot of good points above, unfortunately my complaints about the rear brakes on my 93' go back to the very day I bought the truck. The diesel used the HD 3" shoes and larger cylinders I think that with all the braking power on the rear things are fine if the truck is loaded, but running around empty is darn right dangerous in my mind, and the RABS system did nothing to improve that, it actually made it worse on wet and bumpy roads.
Seb....
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Fleet Mechanic
Joined: Sep 2005
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From: Ladner, British Columbia
Here is a picture of Proportioning Valve installation:
https://www.ford-trucks.com/user_gal...id=140104&.jpg
https://www.ford-trucks.com/user_gal...id=140104&.jpg
Senior User
Joined: Jul 2006
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From: Prunedale CA
What year did they start putting the RABS in? I have the box described in my rig just above and to the right of the gas pedal and also have the mechanical valve. I s this right or is the box I am seeing something else? Are there any dash light for the RABS?
Thanks,
Thanks,
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Fleet Mechanic
Joined: Sep 2005
Posts: 1,509
Likes: 3
From: Ladner, British Columbia
Originally Posted by F450 Aaron
What year did they start putting the RABS in? I have the box described in my rig just above and to the right of the gas pedal and also have the mechanical valve. I s this right or is the box I am seeing something else? Are there any dash light for the RABS?
Thanks,
Thanks,
In 92' they started putting the control box behind the glove compartment.
As I said many times, the early RABS systems will actually increase your braking distance under conditions such as wet roads, bumpy roads, gravel, etc... Also I felt that the proportioning between the front and the rear was not right with too much emphasize on the rear brakes.
Seb....
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