Brake Hose - Front

Replace the front brake hose connecting the brake line to the caliper, including bleeding the brake system to remove air and restore proper brake function.

Warnings

Tools required

Parts

• Front brake hose assembly × 1 — Use OEM specification
• Copper crush washers for banjo bolt × 2 — GM P/N 18008789 or equivalent

Fluids

• ACDelco DOT 4 Brake Fluid — 0.5 qt

Preparation

1. Park vehicle on level ground, engage parking brake, and place wheel chocks behind rear wheels
2. Disconnect 12V battery negative terminal to disable regenerative braking and prevent electrical issues
3. Loosen front wheel lug nuts while vehicle is still on ground (do not remove)
4. Raise front of vehicle with floor jack and support securely on jack stands at manufacturer-specified lift points
5. Remove front wheel on the side requiring hose replacement
6. Clean brake hose connections, banjo bolt, and bracket areas with brake cleaner to prevent contamination
7. Open brake fluid reservoir and check level - do not overfill as fluid will be displaced during bleeding
8. Have catch pan ready to collect brake fluid spillage

Procedure

1. 1

   Remove brake hose from caliper
   Locate the banjo bolt connecting the brake hose to the caliper. Hold the hose fitting steady with a wrench while using another wrench to loosen and remove the banjo bolt. Remove the bolt completely and separate the hose from the caliper. Immediately plug or cap the caliper port to minimize fluid loss. Note the position and orientation of the two copper crush washers on either side of the hose fitting - these must be replaced with new washers.
2. 2

   Disconnect brake hose from brake line
   Using a line wrench (flare nut wrench) on the brake line fitting, and a combination wrench to hold the brake hose end steady, carefully loosen the threaded connection between the hard brake line and the flexible hose. Once loose, unthread by hand and separate. Allow fluid to drain into catch pan. Inspect the brake line end for damage or stripped threads.
3. 3

   Remove hose from mounting bracket
   Locate the brake hose retention bracket on the strut or chassis. The hose is typically held by a spring clip or bolt. Remove the fastener securing the hose to the bracket and carefully extract the hose from the bracket. Note the routing and position of any clips or retainers for proper reinstallation.
   Torque spec

   Brake Hose Bracket10 Nm (7 lb-ft)
4. 4

   Inspect and prepare new brake hose
   Remove the new brake hose from packaging and verify it matches the old hose in length, end fittings, and bracket configuration. Ensure the hose is free from kinks or damage. Verify you have two NEW copper crush washers for the banjo bolt - never reuse old washers. Remove protective caps from hose ends just before installation to prevent contamination.
5. 5

   Install new brake hose to bracket
   Route the new brake hose through the mounting bracket, ensuring it follows the same path as the original hose without twists or kinks. The hose must not contact any moving suspension components, the tire, or sharp edges through full suspension travel and steering range. Secure the hose to the bracket with the clip or bolt, ensuring proper orientation.
   ⚠Verify the hose has adequate clearance by turning the steering wheel lock-to-lock and cycling the suspension. A kinked or twisted hose will fail prematurely and can cause brake failure.
   Torque spec

   Brake Hose Bracket10 Nm (7 lb-ft)
6. 6

   Connect brake hose to hard brake line
   Thread the brake hose fitting onto the hard brake line by hand until snug, ensuring threads engage smoothly without cross-threading. Use a line wrench on the fitting and hold the hose end steady with a combination wrench. Tighten the fitting to specification using a torque wrench. Do not over-tighten as this can damage the flare and cause leaks.
   Torque spec

   Line Fittings20 Nm (15 lb-ft)
7. 7

   Connect brake hose to caliper with new washers
   Position one NEW copper crush washer on the caliper side of the banjo fitting, insert the banjo bolt through the hose fitting, place the second NEW copper crush washer on the bolt, and align the assembly with the caliper port. Thread the banjo bolt in by hand initially. Ensure the hose is not twisted and the banjo fitting sits flush against the caliper. Tighten the banjo bolt to specification using a torque wrench.
   ⚠️CRITICAL: Both copper crush washers MUST be new. Reusing old washers will cause brake fluid leaks and eventual brake failure. Verify washers are properly positioned before tightening.
   Torque spec

   Brake Hose Banjo Bolt25 Nm (18 lb-ft)
8. 8

   Bleed brake caliper
   Locate the bleeder screw on the caliper. Attach clear tubing to the bleeder screw with the other end submerged in a container partially filled with fresh DOT 4 brake fluid. Have an assistant slowly depress the brake pedal (or use a pressure bleeder). Open the bleeder screw 1/2 to 3/4 turn. Fluid and air will flow through the tube. Close the bleeder screw before the pedal reaches the floor. Repeat this process until no air bubbles appear in the fluid stream and only clear, bubble-free fluid flows. Check and maintain brake fluid reservoir level throughout bleeding - never let it run dry.
   ⚠️If brake fluid reservoir runs empty during bleeding, air will enter the ABS hydraulic control unit requiring dealer-level scan tool bleeding procedures. Monitor reservoir level constantly.
   Torque spec

   Bleeder Screw14 Nm (10 lb-ft)
9. 9

   Inspect all connections for leaks
   With brake system pressurized (pedal depressed), carefully inspect the banjo bolt connection at the caliper and the line fitting connection for any signs of brake fluid seepage or drips. Wipe connections dry and recheck. Also verify the hose is not kinked and has proper clearance. If any leaks are detected, relieve pressure and re-torque the leaking connection or replace damaged components.
10. 10

    Reinstall wheel and lower vehicle
    Reinstall the wheel, threading lug nuts by hand initially to prevent cross-threading. Tighten lug nuts in a star pattern with hand tools until snug but not fully torqued. Lower the vehicle from jack stands until the tire just contacts the ground (wheel cannot spin but vehicle weight is not fully on suspension). Torque lug nuts to specification in a star pattern. Fully lower vehicle and remove jack stands and jack.
    Torque spec

    Wheel Lug Nuts136 Nm (100 lb-ft)

Reassembly

1. Reconnect the 12V battery negative terminal
2. Top off brake fluid reservoir to the MAX line with fresh ACDelco DOT 4 brake fluid
3. Pump brake pedal multiple times until firm pedal feel is achieved - pedal should not sink to floor
4. Recheck all brake connections for leaks with pedal pressure applied
5. Remove wheel chocks

Verification

• Start vehicle and verify brake warning light is not illuminated on instrument cluster
• With vehicle stationary, apply firm brake pedal pressure and hold for 30 seconds - pedal should remain firm and not slowly sink
• Perform low-speed brake test in safe area (parking lot) at 5-10 mph to verify brakes engage properly without pulling to one side
• Perform moderate-speed brake test at 20-25 mph in safe area to verify firm pedal feel and straight-line stopping
• Check brake fluid level after test drives - should be at MAX line with no signs of leakage
• Final inspection: Turn steering lock-to-lock with vehicle stationary and verify brake hose has clearance with no contact or binding
• Before returning to normal driving, verify brake pedal feel is firm and responsive with no sponginess or unusual sounds

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