brake problem in germany

Suspension, Brakes, Tires, Wheels etc..

brake problem in germany

Postby flammulator » Fri May 05, 2017 2:57 pm

Hello from germany.
1970 D200 ,383,camper special,power brakes.

New parts: master cylinder,4 wheel cylinders,all hoses,brake shoes,some lines.
master cylinder bench bleeded
system bleeded in the right order
brake shoes are correct adjusted also the push rod from the booster.

I have read here many helpfull threads and tryed all possibilities.

good hard pedal BUT when the engine is running there is no pedal.The car brakes a little bit befor the pedal is on the bottom.

The master cylinder i bought is the same like the old one,with 4 bolts to the booster.1" bore.I found the MC by rockauto by the trucks wich are older or with small blocks.
Someone changed the booster and the MC???
Not thinking about it i bought 4 wheel cylinders for the 383. Bore 1 1/8".

Could the different bore size be my problem?

Rene
flammulator
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 78
Joined: Sun Feb 21, 2016 1:12 pm
City: germany
State: Foreign

Re: brake problem in germany

Postby MadMC63 » Fri May 05, 2017 3:15 pm

Sounds like a vacuum problem.
1971 Dodge D100
So what's wrong with setting beneath a single pull string incandescent light bulb writing angry letters?
User avatar
MadMC63
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 570
Joined: Sat Nov 14, 2015 12:16 pm
City: Rome
State: GA

Re: brake problem in germany

Postby Conrad » Fri May 05, 2017 3:17 pm

I was thinking the same thing - booster/vacuum leak maybe? Air in the system or need to bench bleed the master cylinder?

I forget if this is 4 drums and you added the booster. I don't know enough about the length of booster-master pushrod to know
Conrad
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 154
Joined: Sat Jul 23, 2016 4:45 pm
City: Austin
State: TX

Re: brake problem in germany

Postby flammulator » Fri May 05, 2017 3:46 pm

The system runs last year with this booster.
Brake shoes was done after the summer,three wheel cylinders was wet,...
So i have changed all the parts.
flammulator
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 78
Joined: Sun Feb 21, 2016 1:12 pm
City: germany
State: Foreign

Re: brake problem in germany

Postby PwrWgnDrvr » Fri May 05, 2017 9:46 pm

Did u try pumping the pedal several times quickly?
PwrWgnDrvr
Sweptline.ORG Pioneer
Sweptline.ORG Pioneer
 
Posts: 5087
Joined: Wed Dec 31, 1969 6:00 pm
Location: Walnut Creek, CA

Re: brake problem in germany

Postby Conrad » Fri May 05, 2017 10:20 pm

I like Terry's suggestion. I had an old rambler that I did a brake job on once and thought I had bled everything after replacing brake cylinders, and still could not get decent pedal pressure unless I pumped it. I took it to Midas and they laughed me out of there saying I shouldn't have done the job if i didn't know how to bleed the brakes. I limped it home and went around and around the car on each cylinder until I eventually got the air out.

I eventually bought a mightyVac because I have a van that has a hydraulic clutch requires me to pump fluid up from the lowest point through the cylinder up to the reservoir to get all the air out. I'm still looking for a better solution for flushing fluid however.
Conrad
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 154
Joined: Sat Jul 23, 2016 4:45 pm
City: Austin
State: TX

Re: brake problem in germany

Postby flammulator » Sun May 07, 2017 2:04 am

Hello.
We have tryed also to pump quickly.
Yesterday i have opened each wheel cylinder after another and let fluid drop about an hour each.
Hard pedal if engine is not running.
Running engine spongy pedal to the floor.
With engine running i disconnected the hose from the booster.Engine rpm gets higher and pedal is also spongy.
???
flammulator
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 78
Joined: Sun Feb 21, 2016 1:12 pm
City: germany
State: Foreign

Re: brake problem in germany

Postby 712edf » Sun May 07, 2017 7:29 am

flammulator wrote:With engine running i disconnected the hose from the booster.Engine rpm gets higher and pedal is also spongy.
???
So RPM's increase with the hose plugged or unplugged when disconnect?
If RPM's increase with open hose then that could mean your carb is running a tad rich & the extra air is helping even out the mixture.(this has nothing to do with brakes, just a general observation)

Brake pedal should be same engine Off vs booster disconnected.

Bucky
1966 W500
1975 W600
1978 W200 club cab
712edf
Sweptline.ORG Pioneer
Sweptline.ORG Pioneer
 
Posts: 3445
Joined: Fri Feb 15, 2008 8:46 pm
Location: wichita falls,texas
City: Wichita Falls
State: TX

Re: brake problem in germany

Postby flammulator » Mon May 15, 2017 3:57 pm

Hello again.
Spending again some time on my truck:
-master cylinder again bleeded.ok
-lines again bleeded.ok
-push rod ajusted.ok
-brake shoes adjusted.ok
-booster is ok
-no leaks

long ,spongy pedal.
Today i drove an hour. brakes hot.to much push rod.so i screwed it a little bit back.brakes free.
Now the way is more longer than before.If the pedal is near the bottom the rear wheels brakes.
AND i hear a hiss inside when i push the pedal.I dont know if it was last year too.

Any ideas what i could try?

Rene
flammulator
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 78
Joined: Sun Feb 21, 2016 1:12 pm
City: germany
State: Foreign

Re: brake problem in germany

Postby pwadventurer » Mon May 15, 2017 5:52 pm

regarding the hiss, my 68 300 did that also, brake booster was bad.
User avatar
pwadventurer
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 308
Joined: Wed Dec 31, 1969 6:00 pm
Location: Saylorsburg, Pa.

Re: brake problem in germany

Postby flammulator » Fri May 19, 2017 2:12 pm

Hi.
But if the booster is bad,the pedal must be hard when enginebis running.Am i right ?

Is it possible that the MC is inside bad betwen the front and the rear?
flammulator
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 78
Joined: Sun Feb 21, 2016 1:12 pm
City: germany
State: Foreign

Re: brake problem in germany

Postby PwrWgnDrvr » Fri May 19, 2017 5:03 pm

No. Booster has a vac leak. Still "works" but not correctly.
PwrWgnDrvr
Sweptline.ORG Pioneer
Sweptline.ORG Pioneer
 
Posts: 5087
Joined: Wed Dec 31, 1969 6:00 pm
Location: Walnut Creek, CA

Re: brake problem in germany

Postby JLeather » Tue May 23, 2017 10:49 am

Did the truck have this problem before you replaced the master cylinder, or did it start after you replaced it?
JLeather
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 85
Joined: Mon Dec 27, 2010 4:49 pm
City: Ijamsville
State: MD

Re: brake problem in germany

Postby flammulator » Tue May 23, 2017 1:22 pm

Hello.
Its not the booster.I have tryed one from a guys running/brakeing truck.

Last year the brake was perfect.At the end of the summer there was metal to metal,the hoses was bad,.....
So i have changed the whole system including the master cylinder.
After replacing all the parts i never had a good brake.

If the master will be bad i must also loose pressure when the engine isnt running and the pedal is hard.
But i will not loose the hard pedal?!?
flammulator
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 78
Joined: Sun Feb 21, 2016 1:12 pm
City: germany
State: Foreign

Re: brake problem in germany

Postby MadMC63 » Tue May 23, 2017 4:02 pm

A neat trick is to spray WD40 or Armorall into the booster and if the tear or hole isn't to big everything will work right for a little bit, long enough to know the diaphragm is bad anyway.
1971 Dodge D100
So what's wrong with setting beneath a single pull string incandescent light bulb writing angry letters?
User avatar
MadMC63
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 570
Joined: Sat Nov 14, 2015 12:16 pm
City: Rome
State: GA

Re: brake problem in germany

Postby JLeather » Tue May 23, 2017 9:28 pm

Do you still have the m/c you removed from the truck? Can you measure it and verify it was 1" bore, same as your new m/c?
JLeather
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 85
Joined: Mon Dec 27, 2010 4:49 pm
City: Ijamsville
State: MD

Re: brake problem in germany

Postby flammulator » Tue May 23, 2017 11:09 pm

Yes,it is the same bore. 1".
flammulator
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 78
Joined: Sun Feb 21, 2016 1:12 pm
City: germany
State: Foreign

Re: brake problem in germany

Postby 6969 » Tue May 30, 2017 11:59 am

Did you find the cause for the problem?
User avatar
6969
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 15
Joined: Sun Aug 21, 2016 11:48 am
City: Germany
State: Foreign

Re: brake problem in germany

Postby flammulator » Wed Jun 07, 2017 1:26 pm

Iam not sure because i have ordered new drums and i will receive it next week.

I dont know the right translation.
We have drilled out the drums to the maximum size.
I think the shoes diameter will not perfect fit to the drums diameter .....
flammulator
Sweptline.ORG Member
Sweptline.ORG Member
 
Posts: 78
Joined: Sun Feb 21, 2016 1:12 pm
City: germany
State: Foreign

Re: brake problem in germany

Postby 712edf » Wed Jun 07, 2017 4:40 pm

flammulator wrote:Iam not sure because i have ordered new drums and i will receive it next week.

I dont know the right translation.
We have drilled out the drums to the maximum size.
I think the shoes diameter will not perfect fit to the drums diameter .....
What you mean to says is that you have had the drums "turned" (turned on a lathe). This can be only done so far before the drums get replaced.

Bucky
1966 W500
1975 W600
1978 W200 club cab
712edf
Sweptline.ORG Pioneer
Sweptline.ORG Pioneer
 
Posts: 3445
Joined: Fri Feb 15, 2008 8:46 pm
Location: wichita falls,texas
City: Wichita Falls
State: TX

Next

Return to *SUSPENSION/BRAKE HELP*

Who is online

Users browsing this forum: No registered users and 3 guests