-
The Roadster Factory Recovery Fund - Friends, as you may have heard, The Roadster Factory, a respected British Car Parts business in PA, suffered a total loss in a fire on Christmas Day. Read about it, discuss or ask questions >> HERE. The Triumph Register of America is sponsoring a fund raiser to help TRF get back on their feet. If you can help, vist >> their GoFundMe page.
-
Hey there Guest!
If you enjoy BCF and find our forum a useful resource, if you appreciate not having ads pop up all over the place and you want to ensure we can stay online - Please consider supporting with an "optional" low-cost annual subscription.**Upgrade Now**
(PS: Subscribers don't see this UGLY banner)
Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
STOP!! Never post your email address in open forums. Bots can "harvest" your email! If you must share your email use a Private Message or use the 
smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
Bench bleed tips
- Thread starter bugedd
- Start date
Share this page
secure the cyl vice or clamp to bench, fill with fluid, slowly push piston down and hold, put your finger over the outlet to seal, slowly release the piston, repeat til all air is out, put a piece of tape over the outlet and reinstall, remove the tape and reconnect the pipe, don't push piston down again until pipes are connected and a bleed nipple is open, then bleed as normal
Russ
Russ
dklawson
Yoda
Offline
If you want fittings, visit the plumbing section of the hardware store. Look for barbed hose fittings with a 1/8NPT thread. Chase those threads with a 3/8-24 die. (You'll have to work a bit at this... 1/8NPT is larger than 3/8-24). Place your modified fitting in the master cylinder discharge port. Use a length of rubber hose on the barbed fitting looped back into the MC reservoir.
As an alternate, IF you had (I know you said you don't) any left over old British hydraulic lines (they don't have to be new) cut the end off one leaving the nut in place and an inch or so of tubing. You can thread that into the MC and connect the rubber hose to the short length of tubing.
If you want to buy a kit, call local parts stores looking for Dorman part number 13910.
As an alternate, IF you had (I know you said you don't) any left over old British hydraulic lines (they don't have to be new) cut the end off one leaving the nut in place and an inch or so of tubing. You can thread that into the MC and connect the rubber hose to the short length of tubing.
If you want to buy a kit, call local parts stores looking for Dorman part number 13910.
dklawson
Yoda
Offline
That question can potentially start a multi-page thread as people respond with lots of opinions. There are reasons for DOT-4, DOT-3, and DOT-5.
How much of the braking system have you replaced or rebuilt?
glemon
Yoda
Offline
I have never figured out how I am going to put a line on an already filled MC without dripping fluid everywhere. My "bench bleed" method is crude, but easy, and has worked for me. I install the master cylinder, fill it, then loosen the attachment where the main brake line goes into the master cylinder, a couple turns or so. Then put a bunch of old rags under and around where the brake line exits the MC. Couple slow pumps until fluid comes out of the loose fitting (best with a helper, but I have done it alone) then tighten the fitting back up, remove the rags and bleed as usual. No special fittings/lines and minimal mess.
dklawson
Yoda
Offline
My concerns are as follows.
The original brake rubber up to sometime in the mid-1970s was natural rubber. It was compatible with DOT-4 but not DOT-3. Any brake system fully rebuilt after the 1970s should have rubber that is compatible with DOT-3 and DOT-4. That must include all the rubber (cylinder seals, brake hoses, proportioning valves, etc).
Your car probably doesn't have original rubber brake parts left in it at this point. However, if you want to be 100% safe, flush the system and use DOT-4. Replace the fluid every two years or so to prevent problems.
The original brake rubber up to sometime in the mid-1970s was natural rubber. It was compatible with DOT-4 but not DOT-3. Any brake system fully rebuilt after the 1970s should have rubber that is compatible with DOT-3 and DOT-4. That must include all the rubber (cylinder seals, brake hoses, proportioning valves, etc).
Your car probably doesn't have original rubber brake parts left in it at this point. However, if you want to be 100% safe, flush the system and use DOT-4. Replace the fluid every two years or so to prevent problems.
Gerard
Luke Skywalker
Offline
Regarding your question about bench bleeding, I don’t think you necessarily need to do that with the product I’ve provided. The MC is assembled with a special assembly lube, so you should be able to develop good pressure from the start on the brake side. The clutch side does not have a residual pressure valve, so they can be a little more challenging, however, if you follow the open-pedal down-close bleeder-let pedal up -repeat routine, it shouldn’t be too bad. The best solution is to add a remote bleeder to the slave cylinder. I’ve done that for the last 25 years and I can bleed a clutch in about 3 minutes. A speed bleeder works well also, but still have the issue with access. Whatever you do, make sure bleeder is in the uppermost port; sometimes they are assembled incorrectly.
dklawson
Yoda
Offline
If you are really good and confident no air is in other parts of the system you can indeed do a partial bleed. However, it takes only a little more effort (and fluid) to bleed the whole system. If you do the whole system you will know that there is no trapped air AND you will have removed all the old dirty fluid that was in the system.
Gerard
Luke Skywalker
Offline
I agree, especially the part about flushing all the old fluid out. Moisture, debris and degraded rubber bits will migrate through the system if your old fluid is contaminated with same, which it likely is.
Offline
What is the sound of one hand clapping?
If a tree falls in the forest?...
How many angels dance on the head of a pin?
You are becoming wise in the way of the force.
Similar threads
Similar threads
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Brake/clutch resevoid replaced do I have to bleed the system
- Started by Goldie
- Replies: 9
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
A friendly reminder - be careful what links you click on here. If a link is posted by someone you don't know, or the URL looks fishy, DON'T CLICK. Spammers sometimes post links that lead to sites that can infect your computer, so be mindful what you click.