General Braking system information?
Lead Driver
Joined: Jun 2021
Posts: 5,221
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And aftermarket parts SUCK. Look at this. This replacement adjuster and lever wouldnt even work together period, it would either over adjust or never work(I think it would over adjust and lock up)
The old lever with the new adjuster.. close but its not perfect like stock.
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Tuned
Joined: Oct 2021
Posts: 297
Likes: 42
@AuroraGirl
awesome pictures, appreciate the explanation.
yea I’m running aftermarket parts too, made sure to lube everything up good when I did mine.
To everyone: apologies about the lack of responses, hectic work week and working the weekend when I find the time I’ll snap some pictures of the residual pressure valve/proportioning valve, RABS unit, and a picture and video of the rear drums, including how much drag I set on the drum when I adjust them early next week.
seems there’s something conflicting information on the residual pressure valve as to whether it’s needed or not. AuroraGirl, was there any mention of not needing said valve if the truck is RABS equipped? I’ll have to dive into that further. I’m sure whatever is on there now is supposed to be there. But you never know till you know.
awesome pictures, appreciate the explanation.
yea I’m running aftermarket parts too, made sure to lube everything up good when I did mine.
To everyone: apologies about the lack of responses, hectic work week and working the weekend when I find the time I’ll snap some pictures of the residual pressure valve/proportioning valve, RABS unit, and a picture and video of the rear drums, including how much drag I set on the drum when I adjust them early next week.
seems there’s something conflicting information on the residual pressure valve as to whether it’s needed or not. AuroraGirl, was there any mention of not needing said valve if the truck is RABS equipped? I’ll have to dive into that further. I’m sure whatever is on there now is supposed to be there. But you never know till you know.
Lead Driver
Joined: Jun 2021
Posts: 5,221
Likes: 805
@AuroraGirl
awesome pictures, appreciate the explanation.
yea I’m running aftermarket parts too, made sure to lube everything up good when I did mine.
To everyone: apologies about the lack of responses, hectic work week and working the weekend when I find the time I’ll snap some pictures of the residual pressure valve/proportioning valve, RABS unit, and a picture and video of the rear drums, including how much drag I set on the drum when I adjust them early next week.
seems there’s something conflicting information on the residual pressure valve as to whether it’s needed or not. AuroraGirl, was there any mention of not needing said valve if the truck is RABS equipped? I’ll have to dive into that further. I’m sure whatever is on there now is supposed to be there. But you never know till you know.
awesome pictures, appreciate the explanation.
yea I’m running aftermarket parts too, made sure to lube everything up good when I did mine.
To everyone: apologies about the lack of responses, hectic work week and working the weekend when I find the time I’ll snap some pictures of the residual pressure valve/proportioning valve, RABS unit, and a picture and video of the rear drums, including how much drag I set on the drum when I adjust them early next week.
seems there’s something conflicting information on the residual pressure valve as to whether it’s needed or not. AuroraGirl, was there any mention of not needing said valve if the truck is RABS equipped? I’ll have to dive into that further. I’m sure whatever is on there now is supposed to be there. But you never know till you know.
THe 1996 manual has a Better description, they change the name to Fluid Control Valve (with a Proportioning valve as one of its internal functions)
here is the manual description(same valve, same master designs):
Fluid Control Valve, Brake Master Cylinder
The brake master cylinder fluid control valve (2C161) regulates the hydraulic pressure in the rear brake system. It is located on the brake master cylinder (2140) and is screwed into the rearmost outlet port. When the brake pedal (2455) is applied, the full brake fluid pressure passes through the brake master cylinder fluid control valve to the rear brake system until the valve's split point is reached. Above its split point, the brake master cylinder fluid control valve begins to reduce the hydraulic pressure to the rear brakes, creating a balanced braking condition between the front and rear wheels (1007) to minimize rear wheel lockup during hard braking.In case of the front brake system malfunction, the brake master cylinder fluid control valve has a bypass feature which allows full hydraulic pressure to the rear brake system.
=============
RABS is early ABS tech, and if your rear tires were to lock up more becuase that valve werent there, theres a chance that RABS couldnt , potentially, operate as intended to maintain stability in the right situation, maybe making a crash or at least being unexpected.
All i know is my rabs couldnt do anything but cycle a single time (kinda slugishly) so i disconnected the valve electrically , I plan to go in and fix things right one day , i could try testing what it would do after i get RABS function to normal lol
Lead Driver
Joined: Jun 2021
Posts: 5,221
Likes: 805
@AuroraGirl
awesome pictures, appreciate the explanation.
yea I’m running aftermarket parts too, made sure to lube everything up good when I did mine.
To everyone: apologies about the lack of responses, hectic work week and working the weekend when I find the time I’ll snap some pictures of the residual pressure valve/proportioning valve, RABS unit, and a picture and video of the rear drums, including how much drag I set on the drum when I adjust them early next week.
seems there’s something conflicting information on the residual pressure valve as to whether it’s needed or not. AuroraGirl, was there any mention of not needing said valve if the truck is RABS equipped? I’ll have to dive into that further. I’m sure whatever is on there now is supposed to be there. But you never know till you know.
awesome pictures, appreciate the explanation.
yea I’m running aftermarket parts too, made sure to lube everything up good when I did mine.
To everyone: apologies about the lack of responses, hectic work week and working the weekend when I find the time I’ll snap some pictures of the residual pressure valve/proportioning valve, RABS unit, and a picture and video of the rear drums, including how much drag I set on the drum when I adjust them early next week.
seems there’s something conflicting information on the residual pressure valve as to whether it’s needed or not. AuroraGirl, was there any mention of not needing said valve if the truck is RABS equipped? I’ll have to dive into that further. I’m sure whatever is on there now is supposed to be there. But you never know till you know.
also: Brake Master Cylinder Fluid Control Valve
If there is a brake system concern such as premature rear brake lock up that cannot be attributed to the rear anti-lock brake system (RABS), the cause may be a malfunctioning brake master cylinder fluid control valve (2C161).
Check the brake master cylinder fluid control valve by substituting the suspected bad valve with a known good one. If the condition persists, recheck the RABS. Refer to Section 06-06 for brake master cylinder fluid control valve replacement procedure. Refer to Section 06-09A for RABS diagnostics
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