If equipped with ABS, see the appropriate section for ABS System Bleeding.
When any part of the hydraulic system has been disconnected for service or replacement, air may enter the system causing a spongy pedal action. Bleed the hydraulic system, after it has been properly connected to ensure that all air has been expelled.
Since the front and rear hydraulic systems are independent of each other, if it is known that only one system has air in it, only that system has to be bled.
See Figure 1
- Clean all dirt from the master cylinder filler cap.
- If the master cylinder is known or suspected to have air in the bore, it must be bled BEFORE any of the wheel cylinders or calipers. To bleed the master cylinder, loosen the upper secondary left front outlet fitting approximately 3 / 4 of a turn.
- Have an assistant depress the brake pedal slowly through its full travel. Close the outlet fitting and let the pedal return slowly to the fully released position. Wait 5 seconds and then repeat the operation until all air bubbles disappear.
- Loosen the upper primary right front outlet fitting about 3 / 4 of a turn. Repeat Step 3 with the right front outlet fitting.
- To continue to bleed the brake system, remove the rubber dust cap from the wheel cylinder bleeder fitting or caliper fitting at the right rear side of the vehicle. Check to make sure the wheel cylinder bleeder screw is positioned at the upper half of the front caliper. If not, the caliper is located on the wrong side. Place a suitable box wrench on the bleeder fitting, then attach a rubber drain tube to the fitting. The end of the tube should fit snugly around the bleeder fitting.
- Submerge the free end of the tube in a container partially filled with clean brake fluid, then loosen the fitting about 3 / 4 of a turn.
- Have an assistant push the brake pedal down slowly through its full travel. Close the bleeder fitting and allow the pedal to slowly return to its full release position. Wait 5 seconds, then repeat the procedure until no bubbles appear at the submerged end of the bleeder tube.
- When the fluid is completely free of air bubbles, close the bleeder fitting, then remove the bleeder tube. Install the rubber dust cap on the bleeder fitting.
- Repeat this procedure in the following sequence: left front, left rear and right front. Refill the master cylinder reservoir after each wheel cylinder or caliper has been bled, then install the master cylinder cover and gasket. When brake bleeding is completed, the fluid level should be filled to the maximum level indicated on the reservoir using clean brake fluid from a sealed container.
- Always make sure the disc brake pistons are returned to their normal positions by depressing the brake pedal several times until normal pedal travel is established. If the pedal feels spongy, repeat the bleeding procedure.
For pressure bleeding, use Rotunda Brake Bleeder 104-00064 or equivalent. Always bleed the longest line first. The bleeder tank should contain enough new brake fluid to complete the braking operation. Use only DOT 3 brake fluid from a new, sealed container. Never reuse brake fluid that has been drained from the hydraulic system. The pressure bleeder tank should be charged with 10-30 psi (69-206 kPa) of air pressure.
- Clean all dirt from the reservoir filler cap and surrounding area.
NEVER exceed 50 psi (344 kPa) of air pressure to prevent system damage.
- Remove the master cylinder filler cap, then fill the reservoir with fluid to the MAX fill line. Following the manufacturer's instructions, install the pressure bleeder adapter tool to the master cylinder reservoir, then attach the bleeder tank hose to the fitting on the adapter.
- If all wheel cylinders are to be bled, start with the right-hand rear brake wheel cylinder. Remove the dust cap from the right rear caliper bleeder fitting. Attach a rubber drain tube to the fitting, making sure the tube fits snugly.
- Open the valve on the bleeder tank to admit pressurized brake fluid to the master cylinder reservoir.
- Submerge the free end of the tube in a container partly filled with clean brake fluid, then loosen the wheel cylinder bleeder screw.
- When the air bubbles cease to appear in the fluid at the submerged end of the bleeder tube, close the wheel cylinder bleeder screw, then remove the tube. Tighten to 7.5-8.9 ft. lbs. (10-12 Nm). Replace the rubber dust cap on the wheel cylinder bleeder screw.
- Repeat Steps 3-6 at the left front disc brake caliper.
- Next, repeat Steps 4, 5 and 6 at the left rear wheel cylinder or caliper, and then the right front disc brake caliper.
- When the bleeding procedure is finished, close the bleeder tank valve, then remove the hose from the adapter fitting.
- After disc brake service, make sure the disc brake pistons are returned to their normal positions and that the brake shoe and lining assemblies are properly seated. This is accomplished by depressing the brake pedal a few times until normal pedal travel is established.
- Remove the pressure bleeder adapter tool from the master cylinder. Fill the master cylinder reservoir to the proper level using clean brake fluid from a sealed container.