Poor braking

Well I just took my truck out of storage pushed in the red glad valve went down a hill applied 55 pounds of applied pressure to the brakes and the truck did not even go into anti lock.

This truck weighs empty 27200 and at 73000 it does not like stopping. Its going to the dealer Tuesday to find out what going.

Thanks for the reply's and help

 

Yes I will as there are a lot of other people that want to know whats going on. The brakes have never been that good but since new I thought they migh need to get some miles on them, After I drove another tri-axel then I figured out I had a big problem going on.

The engine brake is always on and I am one to preplan my stops, But in an emergency I think I might be screwed.

Updates to come.

Thanks to all for the reply's
Carl Hinkson

 

Went to the dealer today they pulled all the rear drums to find the shoes and drums looked perfect, They lightly scuffed the shoes and drums, Took it out for a ride with poor results.

Stopped at New England Diesel talked with Allen and the owner and good friend of mine. He said the is a faulty relay valve this is not working properly, You have to look at it this way if you put 30 pounds of air to any one of those air cans it will lock that wheel up.

Allen gave me a fitting to tie into the line going into the air can which will tell you what exactly is going on with pressure. The pressure on the gauge in the dash is only pilot pressure and is not the pressure the air can is seeing. Allen said there is a defective relay valve in the system that needs to be addressed. He said he has seen this before.

When I have time this coming week I will spend some time trying to figure this out.

Just a thought if when Peterbilt installed the pusher axle if they did not put a R13 valve in the system some where so when the axle is up the air to the cans is limited.

Thanks again for all your comments.
Carl Hinkson

 

Well have not done much with my truck still trying to find out some answers.
Took the truck to a shop that does truck work and State inspections ( Good friends of mine ) We hooked up an air gauge to the hose going to air can, Going by the applied air pressure gauge on the dash we applied 25 pounds of air pressure to the system the and air at the air can read 23 pounds.

Then we took the truck out for a ride and they could not believe how poor the brakes were on the truck !!! They wanted to pull my sticker, They could not believe Peterbilt let me out of the yard with brakes that poor. They also run a excavating business and we took out one of there Pete's and that truck stops on a dime. My truck if you go from 10 pounds to 20 pounds it really does not make any difference at 15 MPH.

That being said it looks like the wrong material shoes were installed when the truck was built. Peterbilt did text me the other day thought it maybe the wrong linings.

I will get some answers in the morning when they open up.

Thanks for all your help so far but I think we are headed in the right direction !!!

 

The shoes looked like the were wearing correctly not just on the S-cam sides.

There is very little friction when the brakes are applied.

Peterbilt really has to do something at this point as the truck is not safe to drive, I think when the pusher is down it doing all the work.