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Topic: Rear brake hanging up (Read 704 times) previous topic - next topic

Rear brake hanging up

Had the rear brake pads and rotors replaced 200 miles ago. Took a 120 mile test run today all good until the last 10 miles. Started smelling gas from the stove so I pulled over and set the brakes to get out and shut the gas off at the tank. Continued home and the last 5 miles started smelling brake pads. Got home and the right rear was hot and smelling but not locked up and dragging in the gravel. when I moved it the brake popped and I drove it on down the driveway. It must not of released on that wheel when I got back in and drove home. Any ideas/ also I think the gas valve in the stove is shot. Anyone replaced that as that seems to be the source of the gas smell. It didn't set my gas alarm off but you could smell it. Not a very successful test ride!
Thanks
1996 U295-36, Cummins 300hp, 8.3. Build number 4864. Vin number 1F97D536XTNO54271. Purchased October 31, 2019.

Re: Rear brake hanging up

Reply #1
Did who ever do the brake job grease the calipers?
If so did they use proper grease?
Did they purge the old grease out of the purge vent so not over greased?
After a rebuild over greasing is the major reason for brake caliper non return. When the grease gets hot and expands it has no where to go except move the caliper.

What stove do you have as some have a standing pilot light that has a separate cut off valve.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Rear brake hanging up

Reply #2
Did who ever do the brake job grease the calipers?
If so did they use proper grease?
Did they purge the old grease out of the purge vent so not over greased?
After a rebuild over greasing is the major reason for brake caliper non return. When the grease gets hot and expands it has no where to go except move the caliper.

What stove do you have as some have a standing pilot light that has a separate cut off valve.

Mike


Spot ON!
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Rear brake hanging up

Reply #3
Any ideas/ also I think the gas valve in the stove is shot. Anyone replaced that as that seems to be the source of the gas smell. It didn't set my gas alarm off but you could smell it. Not a very successful test ride!
Thanks

Did you arrive home on the hook of a tow truck?  No?  Then it was a successful trip.

The pilot light will also give off that propane smell if the tank is near empty.  The valve for the pilot light is a little metal rod with a roll pin for a handle.
1992 Foretravel Grand Villa
U225 SBID Build No. 4134
1986 Rockwood Driftwood
1968 S.I.A.T.A. Spring
1962 Studebaker Lark
1986 Honda VF700C
1983 Honda VF750C
Duke, the Dog
N1RPN

Re: Rear brake hanging up

Reply #4
No pilot light on this 4 burner. It has the twist starter knob. Agree. Made it home was good. I'll soap bubble today and see if it is the stove valve.
What's the fix on the brakes. They told me they did clean and grease the caliper pins and charged me extra as it took additional labor time. It hasn't hung up until last night. What is the proper grease? I don't know what they did as I wasn't there. They are a heavy truck repair shop and do lots of air brakes but never an FT.
Can I roll under and visually look at the brake when the park is pulled on to see anything? or do the wheels need to come back off?
thanks
1996 U295-36, Cummins 300hp, 8.3. Build number 4864. Vin number 1F97D536XTNO54271. Purchased October 31, 2019.

Re: Rear brake hanging up

Reply #5
VERY few OTR trucks have air disk brakes, so most truck shops are not familiar with them.

Fire trucks are the other primary place you will find air disk brakes.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Rear brake hanging up

Reply #6
They told me they did clean and grease the caliper pins...
In addition to Mike's questions (up above):

1.  What kind of "grease" did they use on the slide pins?
2.  Did they install the "Helper Spring" kit?

See this thread for info on slide pin lube (pro or con) and helper springs:

Helper springs on Meritor disc brakes
Chuck, Jeannie & Bella the MalChi
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Kia on a Kar Kaddy SS
I may suffer from the Dunning-Kruger effect, but I seriously doubt it...

Re: Rear brake hanging up

Reply #7
After reading the latest here is another thought. If they greased the slide pins with grease, you must live on a gravel drive per your statement in OP, you could have picked up some sand/dirt on  the guide pin and this could have cause the calipers to hang.

 Here is a link to the 4M brake book that you need to work on this type of brakes. https://www.foreforums.com/index.php?action=media;sa=media;in=1701    Look on page 42 of this book about slide pins.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Rear brake hanging up

Reply #8
I'll bet they didn't relieve the grease pressure after greasing. Printed out that page for them,
Thanks much all.
1996 U295-36, Cummins 300hp, 8.3. Build number 4864. Vin number 1F97D536XTNO54271. Purchased October 31, 2019.

Re: Rear brake hanging up

Reply #9
I'll bet they didn't relieve the grease pressure after greasing. Printed out that page for them,
Thanks much all.

FWIW, IF you want or think you need to grease the slider pins, a dry lubricant, moly be damned is a great way to go, and second to that is 60% moly paste, but with the paste you still have the problem of dirt sticking to the pin.

You need a piece of metal harder than the pin to burnish the moly powder into the pin.  A pair of high speed steel tool bits intended for making lathe tools works great.

TS-001 Moly Powder, Super Fine grade

"I" have wedge brakes.  Don't even ask.  I have a Stephens Truck Center across the street from where I live and I watched the guy's eyes when I did ask if they serviced wedge brakes.
1992 Foretravel Grand Villa
U225 SBID Build No. 4134
1986 Rockwood Driftwood
1968 S.I.A.T.A. Spring
1962 Studebaker Lark
1986 Honda VF700C
1983 Honda VF750C
Duke, the Dog
N1RPN

Re: Rear brake hanging up

Reply #10
Bendix manual calls for clean DRY, UNLUBED slide pins. In fact even have a line in the manual saying to recheck and remove any grease from them.

That is from the 1999 shop manual. I don't know if that is still considered "best practices".

Anyone with recent MOT brake service experience who can update?

And, agree with adding the Bendix helper springs.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Rear brake hanging up

Reply #11
I would also check the air brake chamber.
1995 U320C SE 40'
Jeep 4x4 Commander - Limited - Hemi
"The Pack"  Yogi and Diesel our Airedales -  Charlie our Boxer/Akita mix. Gone but NEVER forgotten Jake our yellow Lab.
NRA Law Enforcement Firearms instructor - Handgun/shotgun
Regional Firearms instructor for national Armored Transp. Co.

Re: Rear brake hanging up

Reply #12
Super. Just ordered the helper springs for both axles. Napa on line has them. TWD kit-15018. $55 for both to door, Printed out the page how to purge the grease for the tech.
Thanks much
1996 U295-36, Cummins 300hp, 8.3. Build number 4864. Vin number 1F97D536XTNO54271. Purchased October 31, 2019.

Re: Rear brake hanging up

Reply #13
Just ordered the helper springs for both axles...$55 for both to door...

Each spring kit contains 2 springs and services one brake caliper.

4 kits required to do all 4 brake calipers (both axles).
Chuck, Jeannie & Bella the MalChi
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Kia on a Kar Kaddy SS
I may suffer from the Dunning-Kruger effect, but I seriously doubt it...

Re: Rear brake hanging up

Reply #14
Bendix manual calls for clean DRY, UNLUBED slide pins. In fact even have a line in the manual saying to recheck and remove any grease from them.

That is from the 1999 shop manual. I don't know if that is still considered "best practices".

Anyone with recent MOT brake service experience who can update?

And, agree with adding the Bendix helper springs.
We had MOT replace our pins and added the helper springs in March....they were assembled "dry" no lube used.
Hans & Marjet
1995 U300 "Ben" (#4719)
3176B Cat,4060HD,Jake
SKP#139131
Motorcade#17579
2006 Honda Element (towed)

Re: Rear brake hanging up

Reply #15
Yes. I'm just doing the rear as the fronts are fine and I didn't have them worked on. When they are ready, I'll order 2 more kits.
Who is MOT? I'm ignorant
1996 U295-36, Cummins 300hp, 8.3. Build number 4864. Vin number 1F97D536XTNO54271. Purchased October 31, 2019.


Re: Rear brake hanging up

Reply #17
Bendix manual calls for clean DRY, UNLUBED slide pins. In fact even have a line in the manual saying to recheck and remove any grease from them.

That is from the 1999 shop manual. I don't know if that is still considered "best practices".

The last brake class I attended DRY. My hard copy shop manual still is the same as yours.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Rear brake hanging up

Reply #18
Fot = Foretravel of Texas
1999 U270 40 #5518
USN. USPS.

Re: Rear brake hanging up

Reply #19
These are Meritor brakes. Dry? on the pins?
1996 U295-36, Cummins 300hp, 8.3. Build number 4864. Vin number 1F97D536XTNO54271. Purchased October 31, 2019.

Re: Rear brake hanging up

Reply #20
So which is better. FT service or MOT service?
1996 U295-36, Cummins 300hp, 8.3. Build number 4864. Vin number 1F97D536XTNO54271. Purchased October 31, 2019.

Re: Rear brake hanging up

Reply #21
I would imagine one is no better than the other.
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 840 watts of solar on top
Moving around the country

Re: Rear brake hanging up

Reply #22
MOT vs. FOT....personal preference but currently FOT is closed, MOT is open if you need service now.

I've had good experiences at both places. It's hard to describe the feeling in Nacogdoches for a FT owner. Everything is right there. Whatever your coach needs is right there.

I had an alignment done at FOT last year on the same equipment used when my coach was built. The tech was on the assembly line for my coach in 1993.

I'm a big MOT fan. I bought my coach there and have been back for service. All of my experiences there have been excellent. I find that MOT is all about excellent customer service at every level.


1993 U300 40ft GV SE
Build # 4344
SKP#124254

Western NC mountains

Re: Rear brake hanging up

Reply #23
FOT Service was open last week.  I was told more employees were to come back this morning
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
   U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: Rear brake hanging up

Reply #24
Good to hear that
1993 U300 40ft GV SE
Build # 4344
SKP#124254

Western NC mountains