Rear Brakes Locking Up

[Keith Seymore]

Joining late, but to reiterate: You need to go by the reservoir size.

On the cast iron units: larger reservoir in front services the front brakes.

WIth the aluminum body units: larger reservoir in rear services the front brakes.

But it is ALWAYS larger reservoir = fronts; small reservoir = rear.

K

M/L Astro/Safari master shown as extreme example:

You must be registered for see images attach

 

[WebMonkey]

i really don't have much to add but;
does the '10' series truck have a valve in the rear?

the one that opens up as the weight in the bed increases?
if it did, and was removed, then the back gets full juice even with no weight on the wheels.

my K20 4K ultra HD does and it still works properly.

the thing i'd check is the rear brake assembly itself.
the OP/first post states a serious noise issue coming from the rear brakes.

shoes not run out at first install and have jumped the guide slot?

sorry i'm not much help

good luck
'monkey

 

[legopnuematic]

i really don't have much to add but;
does the '10' series truck have a valve in the rear?

the one that opens up as the weight in the bed increases?
if it did, and was removed, then the back gets full juice even with no weight on the wheels.

my K20 4K ultra HD does and it still works properly.

the thing i'd check is the rear brake assembly itself.
the OP/first post states a serious noise issue coming from the rear brakes.

shoes not run out at first install and have jumped the guide slot?

sorry i'm not much help

good luck
'monkey

No load sensing valve on a 1/2 ton (that I’ve ever seen).

But I would concur, for op to check the rear brakes out, make sure they are properly adjusted.

If they [the rears] are too far out of adjustment, they will bleed ok, but the pedal will feel off. Stuff like late engagement and not an even braking feel.

Easy test is, if hooked up and operable, click the parking brake a couple clicks and take for quick test, then another couple clicks. That expands the shoes and if braking improves, suggests adjustment is needed.

 

[Andronikos]

Joining late, but to reiterate: You need to go by the reservoir size.

On the cast iron units: larger reservoir in front services the front brakes.

WIth the aluminum body units: larger reservoir in rear services the front brakes.

But it is ALWAYS larger reservoir = fronts; small reservoir = rear.

K

M/L Astro/Safari master shown as extreme example:

You must be registered for see images attach

Google Image Result for https://m.media-amazon.com/images/I/31gx0o9ConL._AC_UF894,1000_QL80_.jpg

This link will show you the exact master on my truck.

 

[AuroraGirl]

No load sensing valve on a 1/2 ton (that I’ve ever seen).

But I would concur, for op to check the rear brakes out, make sure they are properly adjusted.

If they [the rears] are too far out of adjustment, they will bleed ok, but the pedal will feel off. Stuff like late engagement and not an even braking feel.

Easy test is, if hooked up and operable, click the parking brake a couple clicks and take for quick test, then another couple clicks. That expands the shoes and if braking improves, suggests adjustment is needed.

tho a LSV would physically function on a half ton , it was designed to let a 3/4 ton truck use modified brake bias and then when they were unloaded, they could limit the rear when unloaded