powerbrakes locking up
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Mountain Pass
Joined: Oct 2015
Posts: 102
Likes: 7
From: Beamsville Ontario
powerbrakes locking up
Hi Folks
Hopefully someone can help diagnosing drum brakes lock up. Any Speed as soon as my foot touches the pedal there on! So i guess im complaining to much power brake?
What Ive completed,
NewMC and Booster
adjusted pushrod booster to MC
Full BF flush and re[placement
all 4 wheel drums pulled checked and serviced
bled .no leaks
So what did i miss is there ab adjustment , or what is making the pedal so sensitive?
Thx for listening!
Hopefully someone can help diagnosing drum brakes lock up. Any Speed as soon as my foot touches the pedal there on! So i guess im complaining to much power brake?
What Ive completed,
NewMC and Booster
adjusted pushrod booster to MC
Full BF flush and re[placement
all 4 wheel drums pulled checked and serviced
bled .no leaks
So what did i miss is there ab adjustment , or what is making the pedal so sensitive?
Thx for listening!
Thread Starter
|
Mountain Pass
Joined: Oct 2015
Posts: 102
Likes: 7
From: Beamsville Ontario
They were unbalanced originally and a bit grabby, now there nice and even but full on with a toe leaning on the pedal! If I m on a smoothie enough drive I can feather them with slight pressure but any deeper than a 1/2 inch in your locking up all 4
Last edited by chappy69; Jan 7, 2026 at 07:00 PM.
Logistics Pro
Joined: Mar 2009
Posts: 4,853
Likes: 607
From: Minnesota
Re-check your pushrod length (both pedal to booster, and booster to MC), sounds like you may be too long. Just a thought.
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Mountain Pass
Joined: Oct 2015
Posts: 102
Likes: 7
From: Beamsville Ontario
as for the pedal adjustment, that shouldn’t have anything to do with brake adjustment or should it? I thought it would just be a comfort adjustment
Last edited by chappy69; Jan 8, 2026 at 09:56 AM.
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Cargo Master
Joined: Mar 2002
Posts: 3,132
Likes: 218
From: W (BY GOD) V
Where did you source the parts, BOX STORE REMAN or an aftermarket 'kit' (added booster)?
Thread Starter
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Mountain Pass
Joined: Oct 2015
Posts: 102
Likes: 7
From: Beamsville Ontario
MC
Dorman M83579 Brake Master Cylinder
I contacted Dorman directly to confirm fitment, maybe they lied???’Last edited by chappy69; Jan 8, 2026 at 12:57 PM.
Cargo Master
Joined: Mar 2002
Posts: 3,132
Likes: 218
From: W (BY GOD) V
Where did you source the booster, REMAN or a UNIVERSAL ONE-FITS-ALL MODEL?
It sounds as though either the MC is too large (piston sizing), the booster is too aggressive or possibly the pedal ratio is not correct. It was like this when you acquired it?
It sounds as though either the MC is too large (piston sizing), the booster is too aggressive or possibly the pedal ratio is not correct. It was like this when you acquired it?
Thread Starter
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Mountain Pass
Joined: Oct 2015
Posts: 102
Likes: 7
From: Beamsville Ontario
the new booster was vehicle specific from a parts website” partsavatar” It was a match set I’m pretty sure it’s
I’m
A1 Cardone 54-73515 Power Brake Booster
I know I didn’t have to do much of anything to the pedal when I installed it, went back almost exactly back , the way the brake light switch is mounted it can only work one way? I know I wasn’t pushing in the booster to set the pedal?
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