How to bench bleed (and disassemble) an ATE brake master cylinder. Mercedes R107 280SL.

[@celts153]

Flying screw are an Olympic sport ! 😂 good job again 👌 I’ve often heard of bleeding problems on new master cylinder, but never saw it clearly. Thx

[@MikesMercsandothercars]

Yes...I spent hours looking for that screw and just by chance happened to meet the neighbour and thought I'd go for the 1 in a million chance. Probably should have done the lottery that day! Mike

[@JML319van]

Another great video

[@MikesMercsandothercars]

Thanks - how did you get on with the carb? I still plan to come down and take a look at your van if you have not sold it. Its just a matter of find ing the time...Mike

[@JML319van]

It's still here. I plan to run it around a bit to make sure nothing else goes wrong with it. It hasn't been used in ages so need the cobwebs blowing out of it 😁

[@MikesMercsandothercars]

@@JML319van Yes - our little Fiat 238 sat for years and needed some proper driving to get all those fluids (and rust!) circulating. In theory when is a good time to take a look - weekends, evenings, daytime? Mike

[@JML319van]

I'm around most of the time Mike. If you give me a day when you want to come I can make sure I'm home

[@DODIKUA]

Thanks for the video. In fact I did not bench bleed my MC while working on my brakes 2years ago, I just bled the whole system by a brake pedal method untill no bubbles were coming out. I have no issues so far. Do you think if I bled the system long enough, that might have replaced the need to do a bench bleed?

[@MikesMercsandothercars]

Sometimes, no matter how long you bleed the system, you wont easily be able to get rid of air bubbles in the master cylinder. This might be linked to the the design of certain master cylinders and also the position of the car...eg pointing upwards. Sometimes, you may have some air in either the front or rear chamber of the brake master cylinder without even knowing it...and the brakes still work fine. In my case, it would have been a disaster to put that new brake master on the car because it leaked and I would never have been able to see this with the unit on the car. Mike

[@DODIKUA]

Thanks for your comment. I discovered my MC was leaking into brake booster the way I could not bleed my brakes, the pedal was still a bit spongy. I think you might find yours leaking the same way.

[@DODIKUA]

Hi Mike, I plan to replace clutch on my 4 speed man. gearbox, so I will have to bleed clutch master cylinder. I know that bleeding should be done from down up in order to get all air out. Do you think I could do bench bleeding in this case as well?

[@MikesMercsandothercars]

@@DODIKUA Hi - when I had to replace the clutch hose on my 5 speed manual, I didnt bench bleed the master - see below: kzbin.info/www/bejne/rnSnlZhuj9hmoLM However..it can be quite tricky to get the air out of the master cylinder - I eventually succeeded by jacking the front of the car up. Mike

[@richardpike4206]

So, the parts supplier offloads their responsibility for their defective product to you to fix it... absolute assholes.

[@MikesMercsandothercars]

...not sure I would put it quite like that but it is a bummer when new parts don't work. I suppose in the case of classic cars, many of these parts may sit on the shelf for years and if they have rubber seals that wont help matters. When I got the fuel injectors refurbished for this car, they only accepted the job if I could confirm that the injectors would be back on a working car within 2 weeks! Mike