FAQs

It is firmly believed by Alltech that the brake fluid specified by the vehicle’s manufacturer is the only one that should be used. This information can be found on the cap of the reservoir.

There are special directions for bleeding a step bore as specified in Alltech’s “Bench Bleeding Instructions” sheet. You should wait 15 seconds between strokes to avoid aeration of the fluid.

The booster could have a defective push rod seal. If this seal is bad, it could suck the brake fluid out of the master cylinder.

Compressed air in the hydraulic system is what causes a low pedal. In order to avoid trapped air, make sure the master cylinder is level when bleeding. Then check for brake hoses swelling/expanding under pressure. Then check brake drums/discs for proper specifications. And then check brake material.

If the piston is stuck, the cause is most likely contaminated fluid. There could be many reasons as to why the fluid could be contaminated such as moisture, rust, or dirt. It is also possible that petroleum-based fluid has been accidentally used. The cylinder may be operational by flushing the system and replacing the bad fluid with fresh fluid that the vehicle’s manufacturer recommends.

Plug the master cylinder ports and press the brake pedal. If the master cylinder is bypassing, the pedal will go down. If the pedal stops hard, the master cylinder is good.

This condition may be due to the master cylinder being mounted on an angle, which causes air to be trapped in the higher end of the cylinder. To help negate the effects of the mounting angle, lift the rear of the vehicle until the cylinder is leveled out. Then proceed to bleed the master cylinder. It is advised to remove some fluid prior to bleeding in order to prevent spilling.