Re: Drum brakes weak
[Re: jst19600]
#1726461
01/10/15 04:56 PM
01/10/15 04:56 PM
|
Joined: Oct 2012
Posts: 1,106 Northeast
VincentVega
super stock
|
super stock
Joined: Oct 2012
Posts: 1,106
Northeast
|
Air in the system is always a possibility. But if you're trying to brake glaze, you shouldn't be using anything finer than 80 grit. You should also be very sore afterwards
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
|
|
|
Re: Drum brakes weak
[Re: jst19600]
#1726462
01/10/15 05:03 PM
01/10/15 05:03 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
What bore MC? (is the pedal effort normal/travel normal just not enough "grab" at the (4) corners?. when you stand on it do the rears lockup first? What I'd start with is put it up on stands & run it in gear & see how the rears brake then spin the fronts by hand as a helper hits the brakes. That'd at least be a start. Others will chime in/advise further. PS Make SURE you are braked to a standstill before shifting to park etc (the illusion fools you cuz the vehicle ain't moving)
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Drum brakes weak
[Re: jst19600]
#1726464
01/10/15 05:38 PM
01/10/15 05:38 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
Alright, I had that on the stock car & it was a partly crimped line. You might slide a floor jack under the pig & you could get it up & see what you get & it'd be alot faster than stands (do it safely of course) but I'm thinking it might be the MC but I would bleed it out first just cuz it'd be easier than changing it & I'm assuming the pedal does not pump up at all
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Drum brakes weak
[Re: jst19600]
#1726466
01/10/15 06:20 PM
01/10/15 06:20 PM
|
Joined: Oct 2012
Posts: 1,106 Northeast
VincentVega
super stock
|
super stock
Joined: Oct 2012
Posts: 1,106
Northeast
|
glazing will certainly reduce braking performance
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
|
|
|
Re: Drum brakes weak
[Re: jst19600]
#1726468
01/10/15 07:02 PM
01/10/15 07:02 PM
|
Joined: Jan 2006
Posts: 587 IL . usa
cjs69mope
mopar
|
mopar
Joined: Jan 2006
Posts: 587
IL . usa
|
just make sure if you get them cut you take them to a place that does drums all the time . i have seen places try to just do a fast cut on the drums and call it good . well that's not good .To rough of finish is bad. The car will take longer to stop as well. Drums need to done in two steps 1 cut fast clean up and 2 slow finish. Don't accept any less. also try adjusting shoes up to where the drum can't be removed easy but still spins with slight drag.
1969 Dodge Charger
1969 Dodge Superbee
|
|
|
Re: Drum brakes weak
[Re: Ronnman]
#1726471
01/11/15 01:13 PM
01/11/15 01:13 PM
|
Joined: Jan 2003
Posts: 21,076 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
|
oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,076
Niles , Ohio
|
First is what shoes did you use?My kid had a shop do the brakes on the 66 Charger and they were crap because of the linings.I used to run notjing but NAPAs best.Now I run Advanced best.Drums should have been truned at least for a clean up.If they arent bad a 3M rolox disc on a die grinder will clean them up but they must be cleaned real good before install.My ? is whay run drums Unless its a show poodle or rare change to frt discs.You will never look back.Oh yeah I did brakes almost every day for 30 years as a tec.Rocky
Chrysler Firepower
|
|
|
Re: Drum brakes weak
[Re: SportF]
#1726473
01/11/15 02:00 PM
01/11/15 02:00 PM
|
Joined: Jan 2003
Posts: 201
Beeware
enthusiast
|
enthusiast
Joined: Jan 2003
Posts: 201
|
Friend used this company. http://www.musclecarbrakes.com/bib6572charger.htmlhe bought both fronts and rear setup. His car really stops great for having 4 wheel drums. Sport F thanks for the link above the semi metallics shoes are what I've been looking for!
|
|
|
Re: Drum brakes weak
[Re: jst19600]
#1726474
01/11/15 02:11 PM
01/11/15 02:11 PM
|
Joined: Jan 2003
Posts: 75,043 U.S.S.A.
JohnRR
I Win
|
I Win
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
|
Quote:
Should i have all drums turned provided they arent out of tolerence?Is it a necessity to put on new shoes again if i turn the drums?
Depends on how much you have driven it with the shoes wearing to the uneven surface of your worn drum.
Seriously you should upgrade at least the fronts to discs , the drum brakes never worked that great even when they were new .
|
|
|
Re: Drum brakes weak
[Re: Ronnman]
#1726475
01/11/15 03:07 PM
01/11/15 03:07 PM
|
Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
top fuel
|
top fuel
Joined: Feb 2010
Posts: 1,645
Phila. Pa.
|
Quote:
How about posting some pictures of the brake setup with the drums removed. Sometimes the shoes get swapped front and back as well as the hardware. Additionally, sometimes a groove is worn in the backing plate and restricts the shoes movement. Anyway, post some pics and the forum will give you places to check. Ron
I agree with this. Pictures would be good. Check for primary and secondary for being swapped. Since you changed wheel cylinders, I assume the whole system was bled thoroughly. Might be worth checking the wheel cyl. diameters just in case something was changed since 1970.
I also agree with RapidRobert on cutting, and not cutting if not needed. If you do resurface on a machine, then the shoes ought to be arced to match. Not many places still do this. Porterfield and Rochester Brake and Clutch are two places that do.
The lining material can also make a huge difference. With drums on all 4, I almost always have preferred semi-metallic, which was getting harding to find at run of the mill parts stores even 20 years ago. You may have to go to Rochester Brake or similar to get what you want.
On most brands, you can get an approximate idea of the friction generated by the lining from the edge code. For all participating manufacturers, this is either ink or impression stamped on the edge of the friction material. EE is fairly typical, FF is better. Lower second letter, such as FE, indicates the friction reduces as the lining gets hot. A lower first letter, such as DE, indicates friction improves as the lining gets hot.
Friction is just one characteristic of the lining material. If you were talking to people in the business of friction materials for racers (like Porterfield or Rochester) you could discuss how 'grabby' and how well they release as well as the amount of modulation available from different linings.
|
|
|
Re: Drum brakes weak
[Re: RapidRobert]
#1726477
01/11/15 04:15 PM
01/11/15 04:15 PM
|
Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
top fuel
|
top fuel
Joined: Feb 2010
Posts: 1,645
Phila. Pa.
|
Quote:
Quote:
If i power brake it with the stock converter it moves very easy,i cant keep it from rolling.
I understand drums ain't discs but lets see if we can find out whats fubared. Even power braked the shoes oughta hold it still
I agree and based on this we know the problem impacts on or is in the front.
|
|
|
Re: Drum brakes weak
[Re: Mattax]
#1726478
01/11/15 05:33 PM
01/11/15 05:33 PM
|
Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
|
About to go away
Joined: Sep 2007
Posts: 14,889
up yours
|
Let's all fly off on wild tangents.
Are your front brakes properly adjusted? I'll bet no.
If they aren't then nothing else will work properly.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
|
|
|
|
|