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Veteran
Posts: 147
 
| Hi Guys. The single circuit master cylinder has a hole in the top for the screw. Would the bleeding work if you put a pressure of around 1.5 bar into the master cylinder with a compressed air gun through the screw hole? Has anyone tried that before?
The lid would of course have to be fastened, for example with a screw clamp.
I apologize if this is a stupid idea. But I'm looking for a better way than pedal pumping with 2 people.
I have just installed new wheel brake cylinders and they tend to hide air bubbles that are difficult to get out.
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Board Moderator & Exner Expert 10K+
Posts: 13049
  
Location: Southern Sweden - Sturkö island | Normally if i'm not in a hurry I open the bleeders just a tiny bit with tubes leading into bottles. this normally works good. If in a hurry I open the fuerthest bleeder and press down the pedal and block it with a wooden stick against the dashboard. It takes 2 - 3 pumps per bleeder.
Are the front cylinders all mounted with the bleeders upwards? |
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Expert 5K+
Posts: 9666
Location: So. Cal | In my experience, if they are "hiding" bubbles, it's because they are really leaking air. Check all the connections and make sure they are good. |
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Expert
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Location: central Illinois | The FSM also says to back off the adjusters so the wheel cylinder pistons can achieve full travel. |
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Veteran
Posts: 147
| The front cyl. all mounted as they should. Yes i did back off the adjusters before bleeding. The pedal is hard, even the next day, but lower as usual. To much travel. The shoes are well adjusted, with slight drag to the drum.
Edited by Todd 2021-03-28 6:22 AM
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Board Moderator & Exner Expert 10K+
Posts: 13049
Location: Southern Sweden - Sturkö island | Check the rest adjusters Todd. Front adjusters turned in the direktion the Wheel turn in Forward motion. Rear adjusters turned in the direktion the Wheel turns in rearward motion. Also check the brake pedal free-play. |
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Veteran
Posts: 147
| wizard - 2021-03-27 3:20 PM
Are the front cylinders all mounted with the bleeders upwards?
Sven wait a minute....no, i had to install the front lower wbc with bleeder screw downwards, because the screws would otherwise be covered by a part of the steering linkage. The old wbc were installed in the same way, so i put it back in the same way because the car braked really well.
It would not be possible to attach a bleeder hose if the wbc were installed as they are intended (bleeder screw upwards).
So I had to install the left lower to the right side and the right lower to the left side.
Isn't that strange, isn't it?
What would be my options to solve the problem? Is it still possible to get the air out?
[img]https://thumbs.picr.de/40850863pn.jpg[/img]
Edited by Todd 2021-03-28 1:14 PM
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Board Moderator & Exner Expert 10K+
Posts: 13049
Location: Southern Sweden - Sturkö island | I'll check for a photo later.
Yes it's possible to use a feeler gauge for to bleed cylinders, not too thin and no sharp edges.
The feeler gauge is inserted between the cylinder wall and the seal. Gently bending the feeler gauge will open a passage. |
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Expert 5K+
Posts: 8947
Location: WHEELING,WV.>>>HOME OF WWVA | i used one like this but made my own heavier 1/2" aluminum plate for the top of the cylinder but this way can
be real messy getting fluid everywhere . that and it's hard to get a really good seal on the plate . even with
a good rubber seal . stopped using probably close to 15 yrs. ago . if your not in a real big hurry , let em gravity
bleed . let em set open a day or 2 or 3 , way less aggravation ------------------------ later
https://www.ebay.com/itm/Motive-Products-Pressure-Power-Brake-Bleede... |
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Board Moderator & Exner Expert 10K+
Posts: 13049
Location: Southern Sweden - Sturkö island | Yes Chuck, the cowboy methods works, but it is messy.
Todd, heres a photo of my left lower cylinder, as you can see, somewhat tight, but no problems to access and to use a tube.
 (Lower front left cylinder.jpg)
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 Lower front left cylinder.jpg (110KB - 197 downloads)
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Veteran
Posts: 147
| Sven thanks a lot for the photo. On the left side it may work. But on the right side it's impossible. The linkage is really too close above the screw. No way..... I don't know why. But the pre_owner did swap the cylinders too. Now I know why. But I never had issues in pedal travel before. Even not with the leakin' Centric wbc I assembled before. So now I wonder why the '61 dart Raybestos make trouble...they fit perfect and look absolutely similar.... and corresponds with the 60 dart centric.
I now try to press down the pedal with a wooden stick between pedal and seat overnight. Maybe there is a change tomorrow.... or maybe not....
Edited by Todd 2021-03-29 12:58 PM
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Board Moderator & Exner Expert 10K+
Posts: 13049
Location: Southern Sweden - Sturkö island | On the fig below you can understand the problem Todd. The connection line goes from the bottom of the lower piston, meaning that if air is trapped above, it will be difficult to get it out with the bleeder facing downwards as well.
Could the steering arm be bent or from the wrong vehicle (check with the other side)?
 (Service_Brakes_Fig_01-rez.jpg)
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Service_Brakes_Fig_01-rez.jpg (158KB - 194 downloads)
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Veteran
Posts: 147
| I'll have to check that Sven. I'll get back soon....
Edited by Todd 2021-03-29 2:29 PM
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Bleeding the brakes....
![[img]https://thumbs.picr.de/40850863pn.jpg[/img]](https://show.picr.de/40850863pn.jpg.html){kind=link}