I have a 2006 3500 Duramax Dually 3500 with the Allison. 2 weeks ago while driving I noticed a vibration in my front left. I initially thought I had a wheel/tire out of balance. It quickly got worse and the truck started pulling to the right. I pulled over and could smell the brake and it was smoking. The left brake was fine. I let it cool down and tried to limp back home. A few more miles down the road and it happened again. I pulled over and tapped the caliper with a hammer. Let it cool down and checked the brake fluid. When I took the reservoir cap off I noticed the rubber seal on the inside of the cap was detached from the cap and down in the neck of the reservoir. I just removed it and started back home. I made it home about 20 miles without a problem. Called a friend with the exact same truck and a lot more experience with it than me. He suggested I change the rubber front brake lines due delamination of the inner lining being a known issue and would account for blocked fluid return and caliper not releasing. I did this and thought it solved the problem. I drove the truck intermittently for 2 weeks with no problem and even pulled the pontoon boat to the lake and back which was a 200 mile round trip.
Last Monday morning my wife went to take the trash to the dump and she called me. Long and short of it, both left front and left back brakes had locked down. She caught a ride home. I went to get the truck after I got off work that afternoon. I drove it 20 miles home with no issues what-so-ever. I was at a loss. I stopped by the garage that just put new front and back brakes on it 6 months ago and they suggested the brake proportioning valve as a possible problem though they were not real confident as this was kind of an unknown issue to them also. They were scheduled to replace it, but due to an employee illness and workload have not been able to pick it up. After 3 days of delay I have decided to attempt to do it myself as I don't know when they will be able to get to it and I'm not real fold of the scattergun approach of just replacing parts until something works approach.
Thought I may join this forum and seek some feedback and direction as to whether anyone else has ever encountered this and is this is a known problem and repair. Also I noted the brake fluid is in desperate need of changing to the point it's green and I'm wondering if sediment in the system could account for this and would a fluid change/flush be something I should attempt first. Any suggestions would be much appreciated.
Last Monday morning my wife went to take the trash to the dump and she called me. Long and short of it, both left front and left back brakes had locked down. She caught a ride home. I went to get the truck after I got off work that afternoon. I drove it 20 miles home with no issues what-so-ever. I was at a loss. I stopped by the garage that just put new front and back brakes on it 6 months ago and they suggested the brake proportioning valve as a possible problem though they were not real confident as this was kind of an unknown issue to them also. They were scheduled to replace it, but due to an employee illness and workload have not been able to pick it up. After 3 days of delay I have decided to attempt to do it myself as I don't know when they will be able to get to it and I'm not real fold of the scattergun approach of just replacing parts until something works approach.
Thought I may join this forum and seek some feedback and direction as to whether anyone else has ever encountered this and is this is a known problem and repair. Also I noted the brake fluid is in desperate need of changing to the point it's green and I'm wondering if sediment in the system could account for this and would a fluid change/flush be something I should attempt first. Any suggestions would be much appreciated.
