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Need help! SRAM Guide Rs bleed problem

1142 Views 3 Replies 3 Participants Last post by Xrunner1987, Nov 25, 2021

Xrunner1987

Discussion Starter · Nov 22, 2021

I bleeded the front brake according to official bleeding video, nothing goes wrong. But weird things happened when I tried to bleed the rear brake. Two syringes attached to lever and caliper, and when I pushed the plunger down, well it won't go down, I feel strong resistance stopping me from inject oil into the caliper. I thought maybe the fitting was broken, so I detached the fitting and pushed the plunger on the lever syringe, oil flows out of the fitting .proving the fitting was not choked. And if push the syringe on the caliper, oil flows out of the caliper fitting port. Weird, isn't it? And it seems that oil can only flow in one direction: from the lever to the caliper.

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11053

· #2 · Nov 22, 2021 (Edited)

Is this a brand new brake system install or are you bleeding a brake system that has been in service before?
If this is an existing system that has been in use prior, then the problem is likely in the lever.
Did you try to bleed with the lever reach adjustment in different positions? If not, try that. Set the reach about 2/3rd of the way out and not fully out. SRAM provides the measurements for lever reach for bleed in their videos.
You could have old gummy DOT fluid and/or disintegrating seals gumming up the ports.
If this is a new brake install, check the fitting on the hose where it enters the lever and make sure the hose fittings are installed correctly and that the hose is fully seated in the lever and tightened to spec.

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915654

· #3 · Nov 22, 2021 (Edited)

Remove the back plunger and just use a hose and ziplock bag. It sounds like you still have a vacuum lock on the system. Or visa versa.

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Xrunner1987

Discussion Starter · #4 · Nov 25, 2021

11053 said:
Is this a brand new brake system install or are you bleeding a brake system that has been in service before?
If this is an existing system that has been in use prior, then the problem is likely in the lever.
Did you try to bleed with the lever reach adjustment in different positions? If not, try that. Set the reach about 2/3rd of the way out and not fully out. SRAM provides the measurements for lever reach for bleed in their videos.
You could have old gummy DOT fluid and/or disintegrating seals gumming up the ports.
If this is a new brake install, check the fitting on the hose where it enters the lever and make sure the hose fittings are installed correctly and that the hose is fully seated in the lever and tightened to spec.

It is a used one. You're right, lever was to blame. I detached the hose from the lever, and pushed the lever syringe while having a pin against the little Stealth-a-majig piston keeping the port open( the thing on the piston spring that seals the lever fitting port if the hose is disconnected), no oil came out. I pushed the lever, oil did come out, so I think there must be something wrong with the reservoir. I saw people having the same issue. Will do some "debug" soon.

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