brakefluid_brakefluid是什么意思_brakefluid颜色(21)

However, it could also mean that the pads are excessively worn or that the rear shoes are out of adjustment。 A pedal that feels spongy when the brakes are applied indicates a small amount of air is in the system。 If you rapidly pump the brakes and the pedal rises and get firmer with each application, it’s a pretty good sign there is air in the system。 On most master cylinders you can test for the presence of air in the system by doing an air entrapment test。Have an assistant rapidly pump the brakes about 10 times and hold the pedal down firmly on the last pump。

Remove the cap from the master cylinder。Have your assistant quickly release the brakes as you watch for a ‘geyser” of fluid in the reservoir。 The part of the reservoir with the geyser has air in it。If you determine that the air is in the rear brake circuit: Remember that if the shoes are far enough away from the drums that they will push significant amounts of fluid back to the master cylinder upon their release giving the impression that there is air in the system。 Always check and adjust shoe to drum clearance first! Bleeder valves become stuck or seized because of several factors。

They are located on a part of the vehicle that is constantly exposed to water, snow, salt, and dirt。 They are exposed to high temperatures。 They have a tapered end that wedges tight into a tapered hole。 This is how they seal。 Because of these factors, you will often find yourself having to break seized bleeders loose。 Here are some tips for dealing with brake bleeders:Always use a 6 point socket or wrench when working on bleeders。Use plenty of penetrating oil on bleeders before attempting to turn them。

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