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Rear Brake Caliper and Hose Replacement
 
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Pelican Technical Article:

Rear Brake Caliper and Hose Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$250

Talent:

****

Tools:

7mm Allen wrench, flathead screwdriver, 13mm line wrench, floor jack, jack stands, wheel chocks, safety glasses, lug wrench, torque wrench

Applicable Models:

Volvo V70 (1998-01)
Volvo V70 2.4T (2001)
Volvo V70 AWD (1998-99)
Volvo V70 GLT (1998-00)
Volvo V70 GLT SE (2000)
Volvo V70 R (1998)
Volvo V70 R AWD (1999-00)
Volvo V70 T5 (1998-01)
Volvo V70 X/C (2001)
Volvo V70 X/C AWD (1998-00)
Volvo V70 X/C AWD SE (2000)

Parts Required:

Rear brake caliper, rear brake hoses, brake fluid

Hot Tip:

Bleed entire brake system

Performance Gain:

Great brake feel

Complementary Modification:

Replace brake pads and rotors at same time

Volvo V70 service brakes consist of hydraulic brake calipers, one at each wheel. When the brake pedal is pressed, brake fluid is forced out of the brake master cylinder and through the brake lines to each brake caliper. Pistons in the calipers push out and clamp the brake pads against the brake rotors (or discs), thus slowing down the vehicle. As it ages, the brake caliper can leak fluid from the piston seal and may also become corroded or restricted, resulting in poor brake performance.

If a brake caliper is not performing at 100%, you may notice a slight pull to one side when braking. You can service each brake caliper individually or both at the same time. Corrosion from road salt and grime may affect moving parts of the caliper other than the hydraulic piston. Sometimes you can clean the sliding mechanical parts of the caliper, including the 7mm Allen sliding bolts (see replacement procedure below). This results in the caliper operating smoothly again. But if this does not work, I recommend replacing the calipers in pairs to maintain an even brake feel. If one caliper is failing, the other will not be far behind.

The rear brake hoses to the calipers are steel and usually last the lifetime of the vehicle. The steel lines run to two flexible rubber brake hoses at the left side of the rear trailing arm. These hoses dry rot and crack over time, causing hose failures. When replacing, I suggest replacing them in pairs as they are mounted side by side.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Lift and support the axle of the vehicle you are replacing the brake calipers on. See our tech article on jacking your vehicle.

Remove the wheels on the axle you are replacing the brake calipers on.

There are two ways to reduce the amount of brake fluid loss when replacing your brake caliper. One way is to clamp the hose with a hose clamp tool to prevent the fluid from leaking. This method could lead to a damaged hose if done incorrectly.

I prefer to use the second method.
Figure 1

I prefer to use the second method. Depress the brake pedal half way and hold it in place with a stick or brake pedal depressing tool (red arrow). This will keep fluid in the master cylinder from leaking.

Remove the brake pads (green arrows).
Figure 2

Remove the brake pads (green arrows). See our tech article on brake pad replacing for more information.

Working at the brake caliper using an 11mm line wrench, loosen the brake line (red arrow).
Figure 3

Working at the brake caliper using an 11mm line wrench, loosen the brake line (red arrow). Do not remove it. You will unscrew the hose from the caliper later. Use a quick loosening action to free the line and be careful not to round off the hex.

Working at the rear of the caliper, remove the two 13mm brake caliper mounting fasteners (red arrows).
Figure 4

Working at the rear of the caliper, remove the two 13mm brake caliper mounting fasteners (red arrows).

Remove the brake caliper from the axle and unscrew the brake hose from the caliper.
Figure 5

Remove the brake caliper from the axle and unscrew the brake hose from the caliper.

The rear brake hoses to the calipers are steel and usually last the lifetime of the vehicle.
Figure 6

The rear brake hoses to the calipers are steel and usually last the lifetime of the vehicle. The steel lines run to two flexible rubber brake hoses at the left side of the rear trailing arm (yellow arrow). These hoses dry rot and crack over time, causing hose failures. When replacing, I suggest replacing them in pairs, as they are mounted side by side. The green arrow points to the hose for the left side caliper. The red arrow points to the hose for the right side caliper.

Working at the trailing arm, at the steel line and hose union, loosen the 11mm steel line nut (green arrow).
Figure 7

Working at the trailing arm, at the steel line and hose union, loosen the 11mm steel line nut (green arrow). Then unscrew the steel brake line (yellow arrow) from the hose (red arrow). The spring clip will come off with the steel line. Repeat this step for the next hose.

Working at the trailing arm and body junction, at the steel line and hose union, loosen the 11mm steel line nuts on the left (green arrow) and right (red arrow) side hoses.
Figure 8

Working at the trailing arm and body junction, at the steel line and hose union, loosen the 11mm steel line nuts on the left (green arrow) and right (red arrow) side hoses. Then unscrew the steel brake line (yellow arrow) from the hose (blue arrow). The spring clip will come off with the steel line. Then remove the hoses from the mounting brackets and install the hoses in the reverse order of removal. Bleed the brakes. See our tech article on bleeding the brakes.


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