Rear brake shake

Im trying to chase down a shake it a 02 tundra 4x4 limited.
The shake is like the abs is engaging but no abs light and you cant feel it in the pedal. I have turned the front rotors even tho there wasn't a shake in the steering wheel. Put new trq drums and shoes on it. Adjusted parking brake like manual said. Also replaced carier bearing. But it still shakes. I have engaged emergency brake while driving to confirm it's the rear and it is. Any help would greatly be appreciated.

 

This is what both shoes on both sides look like after less than 10 miles on the new drums and shoes.

 

I'd give it a few more miles. Also, I'd bed them in by doing a series of 5-10 runs from about 45-5 mph. Sounds like it's just brake shoe to drum interface chatter. Looking at the photo confirms this, IMO. Should smooth out over time and use. Also, I'd throw a couple hundred pounds of shit in the back to activate the LSPV and get more braking from the rear.

 

New drums and shoes, did it happen BEFORE and AFTER the new drums and shoes, or just after?

When was the last time the truck was fully bled (or flushed, tell us which it was)?

When was the last time the truck had a chance to get air in the lines, like, has the master cylinder or booster ever been replaced, or have you ever broken a line?

Does your truck have the LSPV, mounted on the driver framerail over the axle? Has it ever been bled? It's known to get gunk and/or air jammed in it, causing miscellaneous issues, pulsing (if jammed) could be one.

 

It did do it with the old drums and shoes but they didn't have that wear on them. It shakes and almost sounds like it has a busted shock or something but everything seems fine. No bad bushings no play in anything. Replaced a front hose over a year ago and I can't remember if just the front was bled or the whole thing. I'll have to look and see if it has the LSPV.

 

It should have the load sensing prop valve (LSPV). I'd bleed at the valve.

I'd also be checking to make sure each hard line to the drum/cylinder is tight. No signs of leaking. If you had a small leak there or in one of your rear hard lines, I could see it also making things pulse back there; as you're applying pressure to the pedal, anything that would break constant pressure (tiny crack in a line or leak) would cause pulsing, or larger leak would make brakes feel soft.

Does the truck have ABS? You'll know because inside the engine bay, on the passenger wheel well, between the power steering reservoir and firewall there'll be a 7" square cube with hard lines coming out of it.

 

It does have abs. I'll try bleeding everything cause I mean what could it hurt. It's my grandpa's truck and someone talked him into just buying another set of drums. So I guess we'll see what those do.

 

Make sure you use brake clean on the new drums before install.
It's also not impossible to have out of round drums right out of the box.

 

Highly recommend pressure bleeding. If you don't have the tool to pressure bleed, vacuum bleed. I DO NOT recommend old school "jam the pedal" bleeding on these trucks. If you do, throw a 2x4 on the floor to stop the pedal at 1/2 to 2/3 travel so you don't blow out a seal.

 

I borrowed a Snap-on vacuum bleeder to get me close cause i wanted to run all new fluid thru the lines
Then use my short legged wife with the drivers seat back so she couldnt press the pedal to the floor to do the pump pump pump hold