06 GMC SIerra

[fozzgate2]

The truck has 196,000 miles. We are getting no check lights on. Have replaced the breaks and routers along with tires and bearing. The truck will be running great and then all of a sudden it starts shaking like you have a flat tire. It is all you can do to get it out of the road. Then you can place it in park or reverse and proceed for it to run great again. We have notice that most of the time it occurs when you have to slow from a high speed but not always. Any though as to what this could be?

[Jsdirt]

I'd get that front end checked out ASAP - ball joints, or rack ends, or tie-rod ends, pitman/idler arms. Check it all.

[Doug_Scott]

Sounds like maybe the truck is raised or has the steering linkage out of wack. What you are likely feeling is both front tires vibrating sideways as opposed to radially. Hard to explain, but, think of you toe setting changing dramatically while at 40 mph. Or, if you have ever ridden a motorcycle and experienced a "tank slapper". It is basically each front wheel doing its own tank slapper. Cars around you should be able to see it actually happening. Not that I suggest you go try it and see. Jsdirt is correct, get front end checked by reputable people.

[fozzgate2]

Thanks y'all we took it in yesterday and found out the break lines are breaking down so all the work we placed into the routers and all is down the drain. The break fluid is black very black . So when I would slow it was causing the calibers and all to stick. And when I would stop it would release and we was fine. It is in the yard and I am not taking any trips until it is fixed this weekend. Thank you all for your help.

[Doug_Scott]

It sounds like the compensating port is blocked up in the master cylinder. Gives an effect similar to driving with your foot on the brakes. As the brakes heat up, they heat the fluid, which expands, but cannot expand back into the master due to the plugged port. That pushes the caliper piston into the pad, which hits the rotor, applying the brakes, causing more heat, and the circle continues.

 

BTW, you can take a break from fixing your network router, but your rotors are for your brakes. Not being a smartass, just trying to make a point.

[txab]

Router

 

 

 

 

 

 

 

 

Rotor

 

 

[Daryl LBZ]

 

 

 

[Btuggle88]

There is a fine line between OCD's and smartass's. Lol.

[txab]

[gmtech4]

i deleted what i wanted to say !!!!! lol