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Brake Booster Work-around

8dogsbarking

New member
5
7
3
Location
Columbia, SC
I'm always working on keeping my M880 on the road, brake boosters have been quite the problem... because manufacturers don't have them any more! Well... I am sure many of you have figured this out, but I wanted to put my 2 cents in. I have a 1977 M880 and my booster died. I ordered a power brake booster for a 1985 W250 with a 4500 lb axle from Rock Auto (Cardone 5473360). I also ordered the master cylinder for the same 1985 model (Dorman M39712).
The problem people have is with the connection to the brake pedal. A bolt attachment versus a mounting stud. My solution was to take a step bit and drill the booster rod out to the size of the bolt. I have had it in for a month now and you would never know the difference! I also had to make a minor adjustment to the brake light switch, but that was easy since I was already under the dashboard! I am sure that has been discussed before, but I wanted to put this out there in case it helps anyone.
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msgjd

Well-known member
1,064
3,263
113
Location
upstate ny
I have a couple of parts trucks but only one good spare booster left .. I have been concerned as to what to do when/if the M880 or M890 uses up that spare booster and thus someday being stuck being told "NLA". .. Thanks for your info !!!
 

Bob H

Well-known member
Steel Soldiers Supporter
3,140
160
63
Location
Huron National Forest, Michigan USA
I've had M880's for 20 years, several of them. Have not had an issue with a booster yet.
This post is good info if it does happen to me. While I have several parts trucks to pick from, I tend to prefer new over 46 year old brake parts.
 
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