Brake Question...

OKCM38CDN · Post by **OKCM38CDN** » Tue Jan 15, 2019 11:20 am

I recently took the M-38 CDN out for a spin... While out and about the brake pedal started "Pulsing" when the brakes were applied. Brakes worked just pulsed. I am thinking something has come loose or gotten water in it and pulsed as it heated up. Has anyone seen this before and possibly point me in a direction... Figure I would ask as the jeep is outside and not in the garage - there is another there so cannot move it inside to work on it...

Thanks

Bretto · Post by **Bretto** » Wed Jan 16, 2019 4:57 am

Sounds like you have a warped drum(s) to me.

OKCM38CDN · Post by **OKCM38CDN** » Wed Jan 16, 2019 7:09 am

That is what I am thinking... I replaced one (Front Right) awhile back and so it is NOT Stock... So will have to look that one over...

4x4M38 · Post by **4x4M38** » Wed Jan 16, 2019 9:55 am

Your rotors are warped...

Post by **wesk** » Wed Jan 16, 2019 10:27 am

I doubt Hal has a disc brake conversion! I have to agree with Brett on the drum issues.

OKCM38CDN · Post by **OKCM38CDN** » Wed Jan 16, 2019 11:12 am

Not Disc Brakes, wish they were... I had to replace a drum a while back and got one from one of the vendors... Cheap Chinese Junk... Has less than 100 miles on it and it appears to have gone to pot...

Will try to get it checked out today. Temps in the 50's before the Ice Box opens this weekend...

Will advise, thanks for the opinions, helps me stay on track...

G740 · Post by **G740** » Wed Jan 16, 2019 5:53 pm

We have good drums in stock from a US manufacturer. $45 ea.
John
Midwest Military, Inc.

OKCM38CDN · Post by **OKCM38CDN** » Wed Jan 16, 2019 6:31 pm

Will give you a call tomorrow, John... Arctic Blast coming in this weekend... So no work on Jeep...

Jeff_Lee · Post by **Jeff_Lee** » Mon Jan 28, 2019 12:04 am

If it is the drums, check out this old thread...

http://www.willysmjeeps.com/v2/modules. ... ic&t=10815

Cheers, Jeff

OKCM38CDN · Post by **OKCM38CDN** » Thu Feb 14, 2019 9:28 pm

Well, I replaced the suspected drum and that was not the problem...

I even had a neighbor come over and assist me with bleeding the entire brake system thinking I might have water or air in the lines... Still no go...

I then jacked up the jeep and started looking at all the drums, they all appear to be good (I spun the wheels and watched the drums to see if they varied in diameter; crude but it worked). I spun the Driver's rear and had material fall out of the gap between the Backing plate and drum, also there was a dragging noise in the drum.

Took the wheel and drum off and found the brake shoes have totally disintegrated. The linings had completely come off the shoes and lodged in one spot. The drum was full of dust and debris. I removed the shoes and cleaned the area with a brush and canned air, then proceeded to install a new set of shoes.

No more pumping of the brake pedal. I can again lock up all four wheels and stop on a dime as they say.

Next good day I think I will pull the Passenger side and check the shoes there, as I only changed the driver's side at this time... ran out of time and daylight...

Thanks for the input on a definite safety problem...

Would have posted photos but could not get the site to take my photo... EDITED _ Photo was too big of a file - FIXED...

Post by **wesk** » Thu Feb 14, 2019 11:36 pm

It has to be a JPEG and it's file size must be reasonable (0 - 800K) and it must be hosted online already in your album here or elsewhere (must be public).

This makes a good brake troubleshooting lesson. In all the shops I have worked in since the 1960's when a customer brought in a brake complaint we normally test drove it, then put her on the lift and pulled all four brake drums and properly inspected the entire system. Step one and step two every time!

OKCM38CDN · Post by **OKCM38CDN** » Fri Feb 15, 2019 6:44 am

Wes, tried loading it to the site Gallery and would not take...

Will try again today...

Checked and file size was too big all is good...

Xamon · Post by **Xamon** » Sat Feb 16, 2019 8:31 am

I do not see any rivet holes in the shoe material. Just me personally but with two flat surfaces like that I would not trust just glue to hold it together. As far as I know all the original, and every brake shoe I remember seeing has had rivets. I am sure Wes will chime in with a more informed view.

4x4M38 · Post by **4x4M38** » Sat Feb 16, 2019 9:04 am

Hal,
That is a very good question. Can you inspect the backs of your pads to see if there are traces of rivets or rivet holes. They could have filled up with debris.

If no rivets I’m sure we’d like to know who sourced those shoes.

Stay warm!