Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Brake Lines, Connecting To Master Cylinder And Hydraulic Unit
On the Brake Master Cylinder
A - Primary piston circuit of master brake cylinder to hydraulic unit.
- Identification: Tube fitting with threads M 10 x 1
B - Secondary piston circuit of master brake cylinder to hydraulic unit.
- Identification: Tube fitting with threads M 12 x 1
1 - Hydraulic unit to front left brake caliper.
3 - Hydraulic control unit to rear right brake caliper.
4 - Hydraulic control unit to rear left brake caliper.
On Hydraulic Unit
A - Hydraulic unit to primary piston circuit of master brake cylinder.
- Identification: Tube fitting with threads M 10 x 1
B - Hydraulic unit to master cylinder secondary piston circuit.
- Identification: Tube fitting with threads M 12 x 1
1 - Hydraulic unit to front left brake caliper.
- Identification: Tube fitting with threads M 12 x 1
2 - Hydraulic unit to right front brake caliper.
- Identification: Tube fitting with threads M 10 x 1
3 - Hydraulic control unit to rear right brake caliper.
- Identification: Tube fitting with threads M 10 x 1
4 - Hydraulic control unit to rear left brake caliper.
- Identification: Tube fitting with threads M 12 x 1
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.