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Topic Review (Newest First)
01-15-2013 04:00 PM
Oilyrascal
Quote:
Originally Posted by scholman View Post
Oilyrascal,

Adjust the brakes again. The back ones for sure. Adjust the front shoe then the back shoe. You should feel them grabbing the drum as you turn the wheel.

Just so you know changing the size of the lines will not raise the pressure in the system only the amount of pressure it takes the push on the pedal. Leave the lines alone and drive safely.

Scholman
Thanks, I am going to re-adjust after I taker down the road, hopefully that will be soon. I am guessing that is really the only way to get these things centered
01-15-2013 11:48 AM
cobalt327
Quote:
Originally Posted by Oilyrascal View Post
Stupid question maybe but if I wanted more volume within my system why would I not step up to 5/16 brake line?
The bigger lines will increase the overall fluid volume, but the volume the MC piston displaces remains the same. So no net gain in volume at the slaves.
01-15-2013 10:04 AM
vinniekq2 I already posted how to get more movement in the wheel cylinders(after perfect adjustment)
The 4 cylinder system uses twice the fluid as a 2 cylinder system,simple math.The bigger bore master will move more fluid,simple math.

SMALLER bore wheel cylinders will take less fluid to make the shoes move,converse to the master,simple math. Also the fluid displacement is double with the four cylinder system and if you DECREASE the cylinder bores(remember I said you could sleeve them if you cannot buy smaller or adapt smaller)the increase of movement and decrease in fluid displacement is also times 4.What you lose is the torque multiplication. Bigger bore wheel cylinders require less pedal energy than small bore.If the pedal effort is too high(IE: disc brakes) then a power booster could be incorporated
01-15-2013 08:57 AM
NEW INTERIORS I didn't read ever post on this thread.. But do you have all new lines and hose's on this set up ??
01-15-2013 08:28 AM
scholman Oilyrascal,

Adjust the brakes again. The back ones for sure. Adjust the front shoe then the back shoe. You should feel them grabbing the drum as you turn the wheel.

Just so you know changing the size of the lines will not raise the pressure in the system only the amount of pressure it takes the push on the pedal. Leave the lines alone and drive safely.

Scholman
01-15-2013 06:40 AM
Oilyrascal I repaired that leaking brake line yesterday and just now finished bleeding them, I have all 4 wheels locked up tight now, I am not happy with the amount of pedal travel though to do it, I would guess it to be about 3/4 of its full travel, of course on the second pump its right up nearer the top.

I do not think there is much else to do as far as bleeding, this is night and day to the first time I went thru this with the smaller bore master so I am pleased in general.

I am going to get it going now and hopefully drive it within the next couple of weeks and see what it does, I do not have any doubt that the truck will stop just fine, I may still have to look at the possibility of adapting a larger bore master cylinder to the booster I have now if this pedal travel is bugging me still.

I see no reason to scrap all of my hard work and head a different direction.

I do however accept that I really do need the larger bore master, it does make that much of a difference so lesson learned.

I cannot help but wonder though what would a smaller diam 3/16 line do, from what I have read putting a larger line say 5/16 will of course increase the volume which is what I want but that will also increase fluid expansion which would possibly lead to a mushy feeling within the brakes.

So what would happen if I went to a smaller brake line, I am thinking that once the line is filled ( with no air ) than it is filled and so possibly adding the addit. pressure to the line may benefit.

Its all speculation, like the saying goes technically a bumble bee cannot fly but I would like to hear your thoughts/speculations on this.

Thanks for all of your help/suggestions
01-15-2013 04:56 AM
Oilyrascal Stupid question maybe but if I wanted more volume within my system why would I not step up to 5/16 brake line?
01-14-2013 05:31 PM
Oilyrascal
Quote:
Originally Posted by Frankinforesthill View Post
I must ask.
Why are you changing from brakes that worked to an unkown???
Why not repair the brakes to factory specs. and have brakes that are safe.
I have none of the original braking pieces.
01-14-2013 05:02 PM
Frankinforesthill I must ask.
Why are you changing from brakes that worked to an unkown???
Why not repair the brakes to factory specs. and have brakes that are safe.
01-14-2013 04:15 PM
Oilyrascal
Quote:
Originally Posted by seltec8 View Post
80s F600 used a 1 3/4 hydraulic assist master if you still have problems. Axles were disc/drum or disc/disc with a 2 speed.
The picture they show on-line was misleading in its mountining configuration, it shows a 2 holes pattern. The real deal is a 4 hole like a duramax configuration.

Thanks anyway though, I think I have about got this licked anyway, I plan to bleed them one final time tomm now that I have the leaking line straightened out and see where I stand.
01-14-2013 02:42 PM
Oilyrascal
Quote:
Originally Posted by seltec8 View Post
80s F600 used a 1 3/4 hydraulic assist master if you still have problems. Axles were disc/drum or disc/disc with a 2 speed.
Im going now to check on out, thanks
01-14-2013 11:35 AM
seltec8 80s F600 used a 1 3/4 hydraulic assist master if you still have problems. Axles were disc/drum or disc/disc with a 2 speed.
01-14-2013 03:34 AM
Oilyrascal
Quote:
Originally Posted by cobalt327 View Post
The system still has air in it. But I agree it's encouraging that you've now got pedal of some sort.

It'll take there being no air to have this set-up working correctly; there's no room for air being compressed taking up pedal travel. Once that's taken care of you should be back in business.
I am sure the air is within that leaky line I found. Thanks
01-13-2013 08:26 PM
cobalt327
Quote:
Originally Posted by Oilyrascal View Post
I noticed that if I pumped the pedal a bit the pedal would be higher and I am assmuming ( but did not verify ) that all 4 wheels would have been locked up at this point.

Thinking about re-bleeding, dont know if that will help, I was pretty thorough already with the bleeding, any advice to get more pedal room before it sinks would be helpful.

I guess maybe I am running out of pedal again because of there is just not enough room in the pedal to make up for the volume of fluid I need but I can keep working on that.
The system still has air in it. But I agree it's encouraging that you've now got pedal of some sort.

It'll take there being no air to have this set-up working correctly; there's no room for air being compressed taking up pedal travel. Once that's taken care of you should be back in business.
01-13-2013 03:37 PM
Oilyrascal
Quote:
Originally Posted by vinniekq2 View Post
broken fitting,cracked line,nail,loose fitting,rust hole,rubber debris,water,air,other oil,,,,lol.give up
Leaky fitting in the front line, I am actually anxious to fix this one
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