I use the funnel.
I attach a syringe, loaded with fresh oil at the caliper . Being careful to not have any bubbles in the bleed hose.
I then very carefully pull fluid out of the caliper . At this point the funnel should have the stopper removed and fluid added to funnel .
I always find many trapped bubbles near the caliper . These are pulled out and allowed to pass the bleed hose traveling into the syringe reservoir. I patiently wait for all the bubbles to escape out of the syringe reservoir to the air space behind the plunger .
For me this first process of pulling out bubbles near the caliper is crucial for a successful bleed.
Then when I am satisfied there is no air in the new brake fluid I push the fresh oil up the system observing first the traces of black oil followed by generous amounts of fresh clean oil . I then wait for about 5 minutes assuming any bubbles will rise being much lighter than oil . A few taps and shakes reveal a few last remaining bubbles .
The hose hanging on to the caliper is capable of dislodging allowing air in if you are not very careful when you close off the caliper bleed nut.
Bottom line . I pull out air from bottom then push out oil with bubbles from the top.
This has been very successful for me .
I used this same method for a friend's Hope brakes . She said the rear brake is not perfect . They felt great to me doing a parking lot test . Using my caliper suction method I pulled out a piece of swarf left over from the CNC process.!
No way in hell I'm disassembling my calipers or levers to get them functioning to perfection.
That's what I pay shop mechanics to do .
March 28, 2024, 11:15 a.m. - GB
I use the funnel. I attach a syringe, loaded with fresh oil at the caliper . Being careful to not have any bubbles in the bleed hose. I then very carefully pull fluid out of the caliper . At this point the funnel should have the stopper removed and fluid added to funnel . I always find many trapped bubbles near the caliper . These are pulled out and allowed to pass the bleed hose traveling into the syringe reservoir. I patiently wait for all the bubbles to escape out of the syringe reservoir to the air space behind the plunger . For me this first process of pulling out bubbles near the caliper is crucial for a successful bleed. Then when I am satisfied there is no air in the new brake fluid I push the fresh oil up the system observing first the traces of black oil followed by generous amounts of fresh clean oil . I then wait for about 5 minutes assuming any bubbles will rise being much lighter than oil . A few taps and shakes reveal a few last remaining bubbles . The hose hanging on to the caliper is capable of dislodging allowing air in if you are not very careful when you close off the caliper bleed nut. Bottom line . I pull out air from bottom then push out oil with bubbles from the top. This has been very successful for me . I used this same method for a friend's Hope brakes . She said the rear brake is not perfect . They felt great to me doing a parking lot test . Using my caliper suction method I pulled out a piece of swarf left over from the CNC process.! No way in hell I'm disassembling my calipers or levers to get them functioning to perfection. That's what I pay shop mechanics to do .