Operation CHARM: Car repair manuals for everyone.
Home >> Land Rover >> 1994 >> Defender 90 (LD) V8-3.9L >> Repair and Diagnosis >> Brakes and Traction Control >> Hydraulic System >> Brake Proportioning/Combination Valve >> Service and Repair
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Brake Proportioning/Combination Valve: Service and Repair

Pressure Reducing Valve

Service Repair No - 70.25.21






Removal
1. Disconnect battery.
2. Clean Pressure Reducing Valve (PRV) external parts.
3. Place a container under PRV valve to catch escaping brake fluid.
4. Disconnect primary circuit pipe unions from PRV.
5. Disconnect secondary circuit pipe unions from PRV.
6. Cover pipes (A and B shown) to prevent ingress of dirt.
7. Remove single retaining nut and bolt securing PRV to engine bulkhead.
8. Remove valve.

Installation
1. Install valve to engine bulkhead. Tighten bolt to 15 Nm. (11 ft. lbs.).
2. Connect primary and secondary circuit pipes to PRV. Tighten unions (A and B shown) to 16 Nm (12 ft. lbs.).
3. Fill brake reservoir with recommended brake fluid.
4. Bleed the brake system.
5. Reconnect battery and road test vehicle.
pro multis · About Operation CHARM