Hmmwv brake repair questions

[Steve from OSPAAAL]

HI out there
M998 Rear Brake Tool
I am looking for information on where to get a tool to change the pads on my M998 HMMWV What has started out as a simple project has mushroomed Thanks for the past guidance on the hand brake, this however has lead to the real problem of thin rear brake pads. Ideally if anyone is near Fort Myers and has the required too that would be great. I can't seem to find one on ebay which is surprising unless I am looking for the wrong item.

 

[Mike82ndABN]

http://www.bluehummer.com/rebrcacoto.html
http://www.bluehummer.com/ecrebrto.html

or you can do what i did, use a normal piston compression tool, give it a few turns until it gets tight, then using big channel locks grip the hex nut on the piston and turn it clockwise half a turn or so, then turn the compression tool some more until it gets tight. alternate back and forth and it will go back in.

 

[DatGuyC]

I used one of those large flat wrenches you use to remove clutch fans, can't remember the size.

 

[frauhansen]

Did you have to turn it clockwise for pushing the piston back in?

 

[frauhansen]

tm-9-23-20-387-24-1 says on page 70-40 tuning clockwise
"Rotate caliper piston (3) in a clockwise direction and at the same time apply force on outer piston hex until caliper piston (3) is seated in piston bore"

 

[Mogman]

Did you have to turn it clockwise for pushing the piston back in?

I have never worked on the HMMWV rear caliper but if it is like other parking brake/calipers that I have worked on one side will be clockwise and the other side counter clockwise.

 

[mgFray]

I did the rear brakes on my M998, and it was only a single tool to reset the calipers.

I bought the kit: https://modmafia.com/product/brake-pad-replacement-tool-set/

(The T-bar snap-on wrench in the kit is well worth the money! Almost impossible to get another type of tool to the bolts otherwise..). But you can see the brake reset tool there. Just get it on the caliper, and turn it -- it'll compress and turn the piston back in at the same time.

 

[frauhansen]

I made it yesterday with a simple tool like this



And i have to say.. its a pain in the ass!

Because the pistone ist hard to turn, and the caliper is mounted on the brake line, at first you need two person.
At second, i broke the brake line direct at the caliper. AHHHHH!!!
Remove the whole line and mad a new end pice.

The second one o removed the caliper bevor... pushed all back and rotate (clockwise) on both.

T's not a nice job!

 

[mgFray]

When I did my brakes, I took them off the lines and did them on a bench.. (of course silicon brake fluid all over from them being compressed) and needing to definitely bleed them back out... But doing it on the truck was nearly impossible with the hard lines on my M998.

I used the one that turns and compresses at the same time. (More expensive, but far easier!)

I will say the hardest part for me was getting the damned hard line reconnected to the caliper. Everything else took me 15-20 minutes, connecting just the hardline was a good 30 minutes of frustration, swearing and brake fluid running down my arm. (Braided hoses would have been SOOO much easier, then you could do the brake caliper to line in a more comfortable place, THEN hang it.)