ABS Front Master Cylinder Overloaded
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Stage III
Joined: May 2017
Posts: 3
Likes: 0
From: Tacoma
ABS Front Master Cylinder Overloaded
Took a corner too low, high centered on floorboard mounting bracket. Front brake lever took enough force to push the cylinder into a position where the lever no longer contacts it. Cylinder does not come back out to resting position. Removed cap to reservoir and no change. Tapped on plunger, no change. No movement in or out. Tried relieving bleeders at calipers, slight sound of back pressure, no change. Tried to physically retract plunger with pliers, plunger came unseated and fluid slowly seeped from bore. Replaced plunger with little effort, no change.
Question:
Replace complete master cylinder, traditional bleed, electronic if needed?
Or, disassembled existing, rebuild, bleed, test?
Could the force have damaged the ABS system, not allowing the cylinder to spring back because of no relief inline?
I'd hate to spend $150 on a new MC just to find out it was the ABS.
Thanks
Question:
Replace complete master cylinder, traditional bleed, electronic if needed?
Or, disassembled existing, rebuild, bleed, test?
Could the force have damaged the ABS system, not allowing the cylinder to spring back because of no relief inline?
I'd hate to spend $150 on a new MC just to find out it was the ABS.
Thanks
Road Warrior
Joined: Feb 2013
Posts: 1,625
Likes: 123
From: Meridian, Idaho
Okay IMO I would replace everything that was damaged. Expensive yes, lesson learned priceless. Hopefully you are ok . $150 is nothing in parts after you crash. Be thankful.
Replace and feel confident you are dealing with new parts. Not some fixed parts that might hold maybe...slam on the brakes to find out. No thanks.
Ride smart man.
P.S. some info on what kind of bike would be helpful as well.
Replace and feel confident you are dealing with new parts. Not some fixed parts that might hold maybe...slam on the brakes to find out. No thanks.
Ride smart man.
P.S. some info on what kind of bike would be helpful as well.
Outstanding HDF Member
Joined: May 2015
Posts: 2,172
Likes: 377
From: Georgia
Not sure what you mean ny "slight sound of back pressure". Did fluid push out or air suck in?
In the MC, did the return spring Coe out with the piston?
Has the ignition been on during your testing?
My gut instinct, not seeing/hands on, is the spring got jammed up and is not returning the piston. I'd opt to completely replace the MC and if that restores the brakes I'd have a dealer bleed it.
In the MC, did the return spring Coe out with the piston?
Has the ignition been on during your testing?
My gut instinct, not seeing/hands on, is the spring got jammed up and is not returning the piston. I'd opt to completely replace the MC and if that restores the brakes I'd have a dealer bleed it.
Thread Starter
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Stage III
Joined: May 2017
Posts: 3
Likes: 0
From: Tacoma
Not sure what you mean ny "slight sound of back pressure". Did fluid push out or air suck in?
In the MC, did the return spring Coe out with the piston?
Has the ignition been on during your testing?
My gut instinct, not seeing/hands on, is the spring got jammed up and is not returning the piston. I'd opt to completely replace the MC and if that restores the brakes I'd have a dealer bleed it.
In the MC, did the return spring Coe out with the piston?
Has the ignition been on during your testing?
My gut instinct, not seeing/hands on, is the spring got jammed up and is not returning the piston. I'd opt to completely replace the MC and if that restores the brakes I'd have a dealer bleed it.
The spring did not come out.
Ignition has not been on while troubleshooting.
I have since ordered an new MC. When I receive and install I will update with the outcome. I will also tear down the old one and inspect. I believe a new unit is the safest route, thanks for the clarity! Nothing could be worse than failed front brakes.
My only question left unaddressed is regarding the ABS. I wonder if excessive pressure can damage the unit. I guess we will find out after I install the new MC and test.
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