Caution: Rigid brake lines made of metal should be installed at a workshop, as some experience is required for professional installation.
High pressure brake hoses create flexible connections between the fixed parts of the vehicle and the moving parts such as brake calipers. If noticeable damage is found, the hoses must be replaced. Old brake hoses can swell. In this case, the brake fluid cannot flow from the wheel brake cylinder back to the reservoir and the wheel brake overheats. If the corresponding bleed valve on the wheel brake cylinder then opens and the wheel no longer locks up, this indicates that the brake hose is defective.
Safety note for vehicles with ABS If a new brake hose has been fitted or one chamber of the brake fluid reservoir has been completely emptied (for example, as a result of a leak in the brake system or the chamber was not replenished in a timely manner when filling the system with brake fluid), air enters the system and reaches the ABS hydraulic pump. In this case, bleeding from the brake system must be carried out at a workshop using a bleeder. If the vehicle is equipped with an EDS system, the basic adjustment must also be carried out using the diagnostic tool.
Attention: Brake hoses must not come into contact with oil and fuel, and must not be varnished or anti-corrosion agent to protect the underbody.
Removing
Caution: Follow the instructions for handling brake fluid in the previous chapter.
Safety note: There is a risk of accident when lifting the vehicle! You must first read the section «Vehicle lifting».
Raise the car on the goats.
Detach the brake hose from the holder.
First you need to disconnect the brake hose at the point of its connection with the brake pipeline, and then unscrew it from the brake caliper. The brake hose must not be twisted.
Caution: Collect leaking brake fluid with a cloth. If necessary, insert a plug into the hole in the brake pipe leading to the brake master cylinder.
Installation
Install only factory approved brake hoses. Lay the new brake hose so that it sags without twisting. Tighten hose on both sides to 15 Nm.
Attention: Brake hose if required (depends on the version of the brake caliper), screw to the brake caliper with new sealing rings. Connecting bolt (hollow) at the brake caliper, tighten to 38 Nm.
After installation with unloaded wheels (the car is raised) check the mobility of the brake hoses when turning the steering wheel from lock to lock and make sure that the hoses do not touch anything.
Attention: Finally, bleed the hydraulic brake system using a bleeder (at the service station).
Lower the car.
With the car on wheels, check if the hoses track all wheel movements and make sure that the hoses do not interfere with anything.
Attention, perform a security compliance check:
- Are the brake lines tight?
- Is the brake hose in the holder?
- Are the bleed valves tight?
- Is there enough fluid in the brake system?
- With the engine running, perform a leak test. To do this, act on the brake pedal with a force of 200 to 300 N for about 10 seconds (from 20 to 30 kg). Do not loosen the brake pedal. Check all connections for tightness.
Finally, perform a few stops on a street with little traffic.
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