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EarlyBay Forums
Technical
Brake Pedal Low Pressure
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<blockquote data-quote="Moseley" data-source="post: 626802" data-attributes="member: 20098"><p>I’d say your master cylinder is pulling in air. Aside from my previous comments regarding you seeing fluid around it, if the pedal gets worse when bleeding the old fashioned way, it’s likely that the movement of the MC plunger is allowing air in. When bleeding using the pressure bleeder, you’re not moving the plunger, so the seals might be doing a better job. The danger being that if this is the case, you might eventually get a good pedal feel, but after driving and using the brakes, the system will pull air in again. Also, if it were just trapped air in the system, the fluid level in the reservoir would drop as the air is displaced by fluid. If you saw it rise, then something other than the brake fluid is being introduced to the system.</p></blockquote><p></p>
[QUOTE="Moseley, post: 626802, member: 20098"] I’d say your master cylinder is pulling in air. Aside from my previous comments regarding you seeing fluid around it, if the pedal gets worse when bleeding the old fashioned way, it’s likely that the movement of the MC plunger is allowing air in. When bleeding using the pressure bleeder, you’re not moving the plunger, so the seals might be doing a better job. The danger being that if this is the case, you might eventually get a good pedal feel, but after driving and using the brakes, the system will pull air in again. Also, if it were just trapped air in the system, the fluid level in the reservoir would drop as the air is displaced by fluid. If you saw it rise, then something other than the brake fluid is being introduced to the system. [/QUOTE]
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Technical
Brake Pedal Low Pressure
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