Brake booster
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Mountain Pass
Joined: May 2021
Posts: 183
Likes: 21
Thank you. That’s what I thought.
Cargo Master
Joined: Aug 2007
Posts: 2,558
Likes: 69
From: New Zealand
With the change of booster you may also need to adjust the pushrod length.
I think the Chiltons/Haynes manuals specify around .995" of stick-out, or something like that.
But when I replaced both my booster & master cylinder a while ago, that measurement did not work & left the pushrod with some preload on it.
This situation can mean that the brakes drag & overheat.....there needs to be very slight clearance to ensure the master cylinder piston can fully return.
Here's a good video explaining the adjustment from around 31:50.........
I think the Chiltons/Haynes manuals specify around .995" of stick-out, or something like that.
But when I replaced both my booster & master cylinder a while ago, that measurement did not work & left the pushrod with some preload on it.
This situation can mean that the brakes drag & overheat.....there needs to be very slight clearance to ensure the master cylinder piston can fully return.
Here's a good video explaining the adjustment from around 31:50.........
Cargo Master
Joined: Oct 2005
Posts: 2,295
Likes: 25
From: NJ
Also be sure to check for any wetness or signs of leaks from the master cylinder. If it's leaving out the end of the bore it'll kill the diaphragm in the new booster. Easy to change just the booster though. I did mine a few months ago. I recommend painting the new booster if it is not already, keeps it from turning into an ugly ball or rust right away.
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