Mr. Francisco

[FranciscoJ80]

Hi there!

My name is Francisco. I’m owner of Land cruiser 80 series with a 1FZ engine. My car have brakes problem. 

Its lock the brakes by itself and to continue driving it have to stop and bleed the brake. I have already change s the all 4 brake calipers, I have change the vacuum switching valve, the brake pum and the Central Vacuum reservoir, I both new brake pads also. But the problem persist. Please help!
 

 

[Tony Prodigy]

Did you check the sliding pins in the calipers ? The grease may have hardened causing the caliper to bind. You say it happens on all four which is strange but still possible if all are of the same age and use. 

When you replaced the brake pads, did you see some excessive wear on one side of the pads ?

Did you do a proper brake fluid flush ? Old fluid carries a lot of moisture and this can expand when hot and possibly cause the calipers to squeeze.

Another thing to check is the rubber brake hoses and the master cylinder.

Rubber brake hose could be internally delaminated and acting as a one way valve and the master cylinder would lock all four calipers if the piston doesn't retract.

Also, booster push rod could be out of adjustment. 

Edited February 1, 2021 by Tony Prodigy