How to replace a brake hose [AUTODOC TUTORIAL]

How to change brake hose on a car – replacement tutorial

Required Tools:

                      Tap wrench
                    
                      Torx wrench
                    
                      Torx bit
                    
                      Brake hose clip
                    
                      Impact socket
                    
                      Jack
                    
                      Line stoppers

Buy tools

Please note!

A brake hose conveys brake fluid to the actuators
Road safety directly depends on the serviceability of the hose
If any damage is revealed, the component must be replaced immediately
When braking, high pressure builds up inside the hose
If it is damaged and the brake fluid leaks out, the braking system will fail
The car will not be able to stop at the right moment

1.

First, locate the brake hose

Important!
Brake hoses are not only located near the calipersThey can also be located on the undercarriage where the brake line is routed
2.

Check the brake fluid level in the reservoir regularly while working on the vehicle
3.

You can access the hoses using a jack or car lift

Please note!
You can also position the car on a ramp or over an inspection pitIn some vehicles, the wheel does not need to be taken off to remove the brake hose
4.

Before starting to work, clean the fasteners on the caliper and the car body
5.

Treat them with penetrating oil and give it a couple of minutes to work
6.

Clean the work areas with a universal cleaner

Please note!
The fastener on the brake caliper is usually easy to unscrewUnscrewing the fastener on the car body often requires some extra force due to corrosion
7.

There is brake fluid inside the brake hose. To prevent it from leaking, use special stoppers. In this case, there is no need to follow any specific order for disconnecting the elements

AUTODOC recommends:
If you are using a regular hose clamp, clamp off the hose at its baseDisconnect the brake hose from the brake caliper and drain any remaining brake fluid out of the hose
8.

Get acquainted with the design of the component and its fasteners
9.

Take off the brake caliper and unscrew it from the hose, which stays in place.
10.

Alternatively, unscrew the brake line fitting and unscrew the hose from the brake caliper.
11.

Clean the work area of any traces of the penetrating oil to prevent it from getting inside the caliper.
12.

Prepare a drain pan and unscrew the fastener
13.

Follow the hose upwards, unscrewing all fasteners one by one
14.

The last fastener should be the one located on the car body
15.

Remove the brake hose from its mounting seat by slightly twisting it.
16.

Take out the hose and put it into the drain pan.
17.

Unscrew the brake line fitting using a suitable tool
18.

If the fastener starts to rotate together with the brake pipe, clean the nut and carefully loosen it

Caution!
Otherwise, this part of the brake line can get damaged and will need to be replaced
19.

Try turning the fitting a little bit to loosen the threaded connection
20.

Remove the hose fastener
21.

Clean the connection and, holding the hose, unscrew the line fitting completely
22.

Remove the old brake hose from the mounting seat
23.

After removing the hose from its mounting seat on the subframe, unscrew it from the caliper
24.

Block off the brake line to prevent fluid leakage
25.

Check and, if necessary, top up the brake fluid in the reservoir
26.

Thoroughly clean the mounting seats for the new brake hose
27.

Install the brake hose. Use new sealing washers
28.

Tighten the fastener and install the hose according to how it was previously routed
29.

Secure the hose to the car body, paying attention to its fastener's profile

Please note!
Usually, the hose needs to be installed in a certain position
30.

Insert the brake pipe with the fitting into the hose
31.

Carefully screw the fastener onto the fitting
32.

Tighten the fitting
33.

Tighten all fasteners to the torque specified by the manufacturer

Important!
The system needs to be bled since air got into it when the hose was being replaced
34.

Remove the protective cap from the bleeder screw and clean it
35.

Bleed the system of air by pushing the brake fluid through it
36.

Use a brake bleeder device
37.

First, unscrew the bleeder screw slightly
38.

Press the brake pedal repeatedly to pump the brake fluid through the line

Please note!
Air will go out of the bleeder screw which is located at the top of the brake caliperNo air bubbles should be seen in the transparent hose of the bleeder deviceThe device’s check valve prevents air from getting back into the system when the pedal is released
39.

When the transparent hose is filled with brake fluid free of any air bubbles, tighten the bleeder screw
40.

Clean any traces of brake fluid from the work area
41.

Tighten the bleeder screw to the torque specified by the manufacturer
42.

Put the protective cap back on and top up the brake fluid in the reservoir
43.

Make sure the system is leak-tight by pressing the brake pedal several times in a row

Be careful!
Sometimes the fasteners connecting the brake line and hose are badly corrodedUse an additional tool when unscrewing the nut to avoid damaging its edgesIf this does not help, replace the corresponding section of the brake line
44.

Make sure that the surface of the brake disc or wheel hub that will contact the wheel is smooth and clean
45.

Treat the surface with an anti-corrosion agent
46.

Clean the working surface of the brake disc