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Never ending brake nightmare

WildEd

Member
42
23
8
Location
Corbin,KY/Poynor,TX
I've replaced ALL the brake components. Master cylinder, air pack, wheel cylinders etc. I've blead the brakes several times, and can't get the #$@% system to build and hold pressure. There's no fluid leak, and the air system holds adequate pressure. What's the obvious culprit? I'm at my witts end and tired.
 

Elijah95

Certified Rookie
1,239
1,183
113
Location
Georgia
This may sound silly, but are you certain you’re completely bled? Some guys have a real good method, mine is I take a shop vac and crack the bleeders with a small hose on the port, suck it until the fluid is clear starting at the Airpack, followed by right-rear-rear, right intermediate, left-rear-rear, left intermediate, then front right, front left. All while keeping fluid topped off.

Oh speaking of which, on my second m35 my brake pedal return spring was MIA and the pedal wouldn’t return far enough to allow the plunger back, no fluid could go further down. Just a couple things to check


Sent from my iPhone using Tapatalk
 

Katahdin

Active member
1,303
23
38
Location
Scarborough, ME
SInce you didn't mention these:

1) Bleed with a pressure bleeder, do not use the foot method. You may be introducing air into the system by pumping with your foot.

2) Bleed the air pack first, then move to the furthest wheel out and work your way to the front axles.
 

WildEd

Member
42
23
8
Location
Corbin,KY/Poynor,TX
This may sound silly, but are you certain you’re completely bled? Some guys have a real good method, mine is I take a shop vac and crack the bleeders with a small hose on the port, suck it until the fluid is clear starting at the Airpack, followed by right-rear-rear, right intermediate, left-rear-rear, left intermediate, then front right, front left. All while keeping fluid topped off.

Oh speaking of which, on my second m35 my brake pedal return spring was MIA and the pedal wouldn’t return far enough to allow the plunger back, no fluid could go further down. Just a couple things to check


Sent from my iPhone using Tapatalk
Thank you sir. I forgot all about bleeding the air pack. Excuse me while I kick myself in the arse for awhile.
 

WildEd

Member
42
23
8
Location
Corbin,KY/Poynor,TX
This may sound silly, but are you certain you’re completely bled? Some guys have a real good method, mine is I take a shop vac and crack the bleeders with a small hose on the port, suck it until the fluid is clear starting at the Airpack, followed by right-rear-rear, right intermediate, left-rear-rear, left intermediate, then front right, front left. All while keeping fluid topped off.

Oh speaking of which, on my second m35 my brake pedal return spring was MIA and the pedal wouldn’t return far enough to allow the plunger back, no fluid could go further down. Just a couple things to check


Sent from my iPhone using Tapatalk
After rolling around in the dirt and gravel after work for the 3rd day, it appears that the airpack was indeed in need of being blead again. Thanks!
 

Elijah95

Certified Rookie
1,239
1,183
113
Location
Georgia
That’s awesome! Glad we could help, we need pictures of the truck though *hint* *hint*


Sent from my iPhone using Tapatalk
 

hndrsonj

Senior Chief/Moderator
Super Moderator
Steel Soldiers Supporter
7,583
358
83
Location
Cheyenne, WY
 
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