The MGA With An Attitude
BLEEDING the CLUTCH (Reverse Bleeding) - HT-106A
This is follow-up from notes on the prior page about reverse bleeding the clutch hydraulics. I have done this several times, always successful.
The slickest way to do this is get about 4 feet of small bore plastic tubing that will fit tightly onto the bleed nipple. Connect the tube between the right front brake bleed nipple,and the clutch slave bleed nipple. Open both bleed nipples one turn, then pump the brake pedal gently through full stroke a few times. This will push brake fluid backward through the clutch pipe back up to the master cylinder, and all the air goes with it. Since brakes and clutch share the common reservoir, you can pump it continuously, and the fluid just recirculates. When it stops bubbling in the reservoir, close both bleed nipples, and the clutch should work well.
When reverse bleeding the clutch like this, there might be a small amount of air left trapped in the clutch slave cylinder, because the bleed port is higher than the hose port. Open the bleeder, push clutch pedal one stroke and hold the pedal down while you close the bleeder, then let pedal up. When finished, wipe up any spilled fluid, and look for any leaks. And now we have photos and notes to go with it.
On 2/23/2025, Guy Foresman wrote:
I was successful in following your directions. I thought that I would take some pictures of each of your
steps along the way.
Photo #1: The Location of clutch slave cylinder. I loosened the clutch slave cylinder nipple and right front brake bleed nipple. I then tightened them just snug for later release.
Photo #2: I attached a 3 foot section of translucent plastic hose (with a1/4" I.D.) to the clutch slave cylinder bleed nipple.
Photo #3: I removed the right front wheel to allow me to easily access the
right front brake and bleed nipple.
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Photo #4: Looking down at the right front brake bleed nipple.
Photo #5: I attached a funnel to the section of hose that I had first attached to the clutch slave cylinder bleed nipple.
Photos #6 & 7: I filled the 3 foot section of hose with new (Dot 3) brake fluid. The translucent (or clear) hose allowed me to see the brake fluid as I filled the hose before attaching it to the brake bleed nipple. After filling the hose (but before attaching the other end to the brake bleed nipple), I turned the clutch slave cylinder bleed nipple from snug closed to open.
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Photo #8: I removed the funnel, loosened the snug brake bleed nipple one turn, and quickly tipped the end of the hose over and securely onto the brake bleed nipple.
Photo #9: With the hose now in place between the clutch slave cylinder and the right front brake, I watched the reverse bleeding take place as the brake peddle was slowly but fully pressed (by my wife). Earlier, I had made certain that the fill-cap to the master cylinder unit was removed and the reservoir was filled with brake fluid. As the brake peddle was repeatedly pressed and released, I could hear the bubbling come from the master cylinder unit. When this bubbling noise stopped, the brake peddle became firm, and the clutch peddle also operated correctly.
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I hope this is helpful. Thank you very much!! - Sincerely, - Guy Foresman
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