RTH: Brake light warning and buzzer

[Bripars40]

I recently purchased a 2000 Land Cruiser with a known brake buzzer noise. I replaced the hydro booster today and was hopeful that would solve my problems but after replacement the truck is still emitting a high pitch beep inside the cab.

Brakes function great and the new booster kicks on as needed. Brake and traction lights are all on. I tried resetting the computer by disconnecting the battery but nothing changed.

Any advice? I have a 40 that’s simple as dirt so I’m at a disadvantage stepping into the 100 series electronics.

 

[Bripars40]

Another piece of information. I removed the left center ABS relay labeled ABS Motor and the beep went away. I removed all of the abs relays one at a time to check and that was the only one that did anything.

At the moment I have removed all the abs relays on the left side of this picture. So I can drive it and yes I realize my traction control and abs are off now.

Could this be related to a wheel speed sensor?

 

[hickuptruck]

Can't help until you get a Techstream. You got one? You should get one.

 

[Bripars40]

Can't help until you get a Techstream. You got one? You should get one.

Can you elaborate some on this?

Okay, I did a bit of reading and purchased the item below.
https://www.amazon.com/gp/aw/d/B00W97K7O6/ref=ya_aw_od_pi?ie=UTF8&psc=1

Should be here in a few days so I’ll report back. In the meantime does anyone think this could be the speed sensors?

 

[Bripars40]

Well I removed and reinstalled the abs relays and the pump is working and the beep went away but I still have the lights.

I’m fairly certain the pump won’t kick on when the relays are pulled...made for a short drive down the road when the pedal went all the way to the floor.

 

[hickuptruck]

Techstream will give you the errors associated with the lights and buzz. Pedal going all the way to the floor probably means bad master cylinder but there is a rebuild kit for it for $50.

 

[Bripars40]

Techstream will give you the errors associated with the lights and buzz. Pedal going all the way to the floor probably means bad master cylinder but there is a rebuild kit for it for $50.

Copy that. I’ll check on the rebuild kit. Luckily I think the pedal to the floor was related to the abs relays being pulled.

 

[uHu]

Have a look at this TSB:
(and I think there was a thread on this issue in here somewhere, maany moons ago. Couldn't find it easily tho')

 

[Bripars40]

Think I found the issue. I drove around the neighborhood again and the beep came back. When I replace the pump I only disconnected one side of the wiring since the master cylinder was still in the truck. Well I should have removed both sides because I would have seen this...

Guess I get to take it all out again!

 

[Bripars40]

Having trouble getting techstream to connect the VIM.

Also, the new accumulator has power going to it and cycles off and on way too much. I can sit in the truck without touching the pedal and it will cycle about every 30 seconds.

 

[2001LC]

Think I found the issue. I drove around the neighborhood again and the beep came back. When I replace the pump I only disconnected one side of the wiring since the master cylinder was still in the truck. Well I should have removed both sides because I would have seen this...

Guess I get to take it all out again!

View attachment 1589488

Good luck. The trick is to remove screws without damaging leads or housing.

I've been seeing this and is now a new inspection I'm doing. The question here is why are some of these rusting. I've found on clean rust free rigs. I'm suspecting it's a leak of brake fluid from ABS.