Home/
Registry/
Ford/
Bronco/
1987-1991/
1989 Ford Bronco/
Photo
supermotors.net/registry/media/269096
How to Bleed Drum Brakes - Wheel Cylinder Bleeding Sequence & Procedure (Manual)
Reference · 1987-1991 BroncoAll 95 service procedures
Service manual page giving step-by-step instructions for bleeding brake wheel cylinders, including a labeled figure.
Part of 1987-1991 Ford Bronco Service Procedures
This is page 9-13 of a vintage factory service manual's Brakes/Service section covering hydraulic brake bleeding procedures. Section (c) gives the correct sequence for bleeding wheel cylinders, left front, right front, left rear, right rear, bleeding one cylinder at a time to avoid draining the reservoir, and cautions against bleeding with any brake drum removed. Section (d) details manual bleeding without a pressure tank: attaching Brake Bleeder Tube J 628-A to the bleeder valve, opening the valve ¾ turn with Bleeder Wrench J 627, slowly stroking the brake pedal until fluid flows free of air bubbles, keeping the master cylinder filled (about ½ pint per wheel cylinder), and setting final fluid level ½" to 1" below the filler opening. Used fluid must be discarded. Section (e) covers pressure-tank bleeding, with five precautions to prevent air bubbles from entering the system (don't shake the tank, keep it at least ⅓ full of fluid, check line valves, etc.), and instructs applying no more than 35 pounds of pressure to avoid blowing out the master cylinder expansion plug. A photograph (Figure 9-6) shows the bleeder tube and wrench in use at a rear drum brake. Readers learn the complete step-by-step drum-brake bleeding process by both manual and pressure methods.
Is this accurate? Sign in to help verify it.
Frequently asked questions
- What is the correct sequence for bleeding wheel cylinders?
- Left front, right front, left rear, right rear, bleeding one wheel cylinder at a time so the reservoir fluid level doesn't get dangerously low. This expels air from lines nearest the master cylinder first.
- How far should the bleeder valve be opened when bleeding brakes?
- Unscrew the bleeder valve ¾ of a turn, using Bleeder Wrench J 627, after attaching Brake Bleeder Tube J 628-A and placing its lower end in a clean glass jar.
- How much brake fluid does it take to bleed each wheel cylinder?
- Approximately ½ pint of fluid is required to bleed each wheel cylinder. Allowing the reservoir to empty will draw air into the hydraulic system.
- What is the maximum pressure when bleeding brakes with a pressure tank?
- Fluid should be applied to the master cylinder at a pressure not exceeding 35 pounds, too much pressure may blow out the expansion plug in the master cylinder. Pumping the pedal is not necessary with a pressure tank.
- Can you reuse brake fluid caught in the jar during bleeding?
- No. Discard the brake fluid deposited in the glass jar during bleeding; it is poor economy to attempt to clean fluid that has once been used.
No comments yet.