I have a 1973 type 1 body on top of a 1967 frame. I replaced the master cylinder last year. I bled the brakes yesterday. When I tested them the pedal went halfway to the floor and felt spongy. I heard gurgling sounds that seemed to be coming from the master cylinder. With pumping the pedal only moves an inch and feels solid. I tried it this morning and the pedal is back to going halfway and feeling spongy. Can air be trapped somehow in the master cylinder? There's no brake fluid leakage anywhere that I can see.
Thanks for any suggestions,
Kevin
Spongy pedal after bleeding brakes
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bugman742002
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Marc
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Re: Spongy pedal after bleeding brakes
External leakage from the back of the M/C goes into the tunnel and ends up dripping out a hole just ahead of the front transmission mount. If you're losing fluid, take a good look at the main front-to-rear brake pipe - it's common for them to rot out under the driver's feet due to damp carpet.crvc wrote:...There's no brake fluid leakage anywhere that I can see....
How's the pedal freeplay? Should be ~¼" (1mm at the pushrod).
The latest DB&HVWs has an article on M/C replacement that tells you to adjust the pushrod to set the freeplay - Simurda still hasn't learned that the proper procedure is to set the pedal stop first, so the distance from the underside of the pedal to the frame crossmember is 200mm.
To quote from the Bentley manual:
"The pushrod's length is factory-adusted. It need not and should not be altered".
The exception is if you are correcting for previous tampering. It's OK to adjust the pushrod provided the pedal stop is set correctly first.
http://www.shoptalkforums.com/viewtopic.php?t=19358