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.
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HOMESERVICE MANUALSMERCEDES BENZ1989420SELREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMREMOVAL & INSTALLATIONHYDRAULIC UNIT R & IINSTALLATION
1989 Mercedes Benz 420SEL
Hydraulic Unit R & I: Installation
1989 Mercedes Benz 420SELSECTION Installation
- To install, reverse removal procedure. Connect brake lines to hydraulic unit fittings. Brake line identification codes are as follows: Code "V" is line from master cylinder to front brake circuit. Code "H" is line from master cylinder to rear brake circuit.
- Code "L" is line from hydraulic unit to left front brake. Code "R" is line from hydraulic unit to right front brake. Code "H" is line from unit to rear brakes. Bleed brake system. Check for leaks.
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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.