Can I fill my own brake fluid?

You can’t do a complete brake fluid flush yourself, but you can do the next best thing—a fluid swap. This procedure won’t replace all the old fluid with fresh, but you’ll introduce enough new fluid to make a difference.

Where is the fill line for brake fluid?

Locate the brake fluid reservoir – The brake fluid reservoir is normally located under the hood, on the driver’s side of the vehicle, against the back of the engine compartment or near the base of the windshield. Tip: Some vehicles have the brake fluid reservoir under a plastic access panel.

What liquid goes into master cylinder?

Brake fluid
Brake fluid is stored in the master cylinder. When you step on the brake pedal, fluid goes from the master cylinder into the brake lines; when you release the pedal, the fluid flows back into the master cylinder. Essentially, when you check your master cylinder, you’re making sure that you have enough brake fluid.

What causes low brake fluid in a master cylinder?

Low Brake Fluid: While leaks at brake lines, brake hoses, wheel cylinders, and brake calipers commonly result in low brake fluid, they are usually easier to identify because they are more exposed. External master cylinder leaks can be hard to identify because the only leak point is at the rear, which is often hidden in the brake booster.

How big is a master cylinder in a GMC motorhome?

Another common choice is a 34mm (or 1-5/16″) master cylinder with a large rectangular fluid reservoir. This size master cylinder provides sufficient bore and reservoir capacity for an all-disc brake system, but also has some drawbacks.

What should I do if my master cylinder is not working?

Sinking Pedal: When the driver steps on the brake, it should depress to a certain point and stay there. If the pedal continues to drop, it could indicate an internal brake fluid leak. Before condemning the master cylinder, check brake fluid level and check for external leaks from brake lines, calipers, or wheel cylinders.

What kind of push rod does a GMC master cylinder use?

The push rod can easily be fabricated from steel rod stock. The end of the rod that goes into the brake booster sleeve is flat, with a slight chamfer of the edge so it’s not sharp. The side that fits against the master cylinder is rounded so that it seats properly into the conical depression on the back of the master cylinder piston.

What kind of master cylinder do I Need?

34mm Master Cylinders Another common choice is a 34mm (or 1-5/16″) master cylinder with a large rectangular fluid reservoir. This size master cylinder provides sufficient bore and reservoir capacity for an all-disc brake system, but also has some drawbacks.

What was the original GMC master cylinder number?

The cross reference is GM part number 14009146, or a 1979-1995 GMC/Chevy P30 or P3500 van with all wheel disc brakes. NOTE: The original master cylinder had the rear brake lines coming off the front reservoir.