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sprinkles08
sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 16875
Experience:  ASE Master and Advanced level certified. Factory trained with 14 years dealership experience
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tacoma: have a 1997 toyota tacoma 4x4 extra cab with a 2.7

Resolved Question:

have a 1997 toyota tacoma 4x4 extra cab with a 2.7 auto. when the truck is in 2wd the rear brakes do not function both up on jack stands and on the road, when it is 4x4 and you step on the brakes all 4 corners stop both on stands and on the road..
Submitted: 10 months ago.
Category: Car
Expert:  sprinkles08 replied 10 months ago.

Hello and welcome to JustAnswer!

 

I believe the reason you are seeing this is because of the mechanical link between the front and rear wheels when in four wheel drive.

 

Obviously in two wheel drive power is only transmitted to the rear wheels and the front wheels and driveshaft are just freewheeling.

 

When you put it in four wheel drive then there is a mechanical link between the front and rear wheels. When on a hoist the front and rear wheels will either spin or stop together because they are locked together through the transfer case. There is no hydraulic or mechanical reason that the rear brakes would work or not work in four wheel drive, I believe the reason you are seeing the wheels stop when in four wheel drive is simply because the front brakes are stopping the rear wheels through the locked transfer case.

 

The rear brakes may not be working for a few reasons. It could be rear wheel cylinders or the shoes could be that far out of adjustment. The problem could also be hydraulic.

 

If no fluid is reaching the wheel cylinders then they can't apply. The problem could be in the master cylinder, proportioning valve or ABS hydraulic control unit. More common though would be a collapsed brake hose.

 

There is hard line running to the rear which then goes into a flexible brake hose between the frame and differential, and then it goes out to the wheels. Brake hoses will often collapse internally, there is a good chance your rear brake hose has collapsed internally and is preventing pressure from reaching the wheel cylinders.

sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 16875
Experience: ASE Master and Advanced level certified. Factory trained with 14 years dealership experience
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