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need more rear brake drum brakes

  
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need more rear brake drum brakes

 
McKownMotorsports42 McKownMotorsports42
I watched NASCAR once | Posts: 2 | Joined: 02/13
Posted: 02/09/13
01:21 AM

ok, i race street stocks, have a metric chassis, my track gave us the option to run the tall spindles and big brakes on the front so i did, only problem i have now is i cant get enough rear brake in the car, i run no stock proportioning valve, and have a bias adjuster, but its maxed out, any tips for geting more rear brake, does anyone know of any racing drum brake shoes, thank you so much for any help  

Serpico Serpico
I watched NASCAR once | Posts: 2 | Joined: 02/13
Posted: 02/09/13
03:22 AM

Are you sure your brake bias is working properly? All a brake bias is a valve to open or close a circut. Check that first....

If you are using a bigger wheel cylinder it requires more brake fluid.

Bendix brakes, wilwood, baer. All those companies should help you out.

Bob AKA pepsi1  

McKownMotorsports42 McKownMotorsports42
I watched NASCAR once | Posts: 2 | Joined: 02/13
Posted: 02/11/13
04:20 AM

Yes the bias is working properly. With the stock front brakes it was mabye half way but now is maxed. And as for the wheel cylinder its still stock metric stuff for rear brakes  

waynep71222 waynep71222
I watched NASCAR once | Posts: 17 | Joined: 04/12
Posted: 02/12/13
02:10 PM

i am taking that your front brakes are locking up very early..


gm and ford varied brake bias by changing wheel cylinder sizing..

can you narrow down the application the rear end is out of...

you might want to get with the parts manager at your local parts store with some cash to buy the parts..   parts stores don't like to sell incorrect application brake parts...

find some various larger diameters of wheel cylinder from various models.

i have seen wheel cylinder range from 5/8" to 1 1/8"  

some wagons also have 11 inch rear brakes..  again fine tuning with wheel cylinder sizes..  if it does not work right out of the box..

i will get over to my other computer and possibly post some part numbers...


i took a LOOK at one of my catalogs.. i am taking that these are SNAP IN wheel cylinders with a latching ring that grabs the sides of the back of the wheel cylinder..

i looked up one metric chassis...

87 elcamino...  it uses 3/4" rear wheel cylinder...
bendix number E139-67-009   AZ # 33891...

i also looked thru my wheel cylinder images.. the only other snap in type wheel cylinder was from an 87 S10 blazer 2wd... with a bendix wheel cylinder number E139-71-021  AZ# 33892 but this is only for the 2 wheel drive versions with MANUAL brakes...  power brake versions get the same 3/4" wheel cylinder as the elcamino

the 7/8" versions at AZ are probably brakeware brand..

i did not see any other sizes in snap in type for the metric rear ends that have the steel bracket sticking up behind the backing plate..   perhaps this will help...

 33891   3/4"

 33892  7/8"

both use 3/8-24 thread inverted flair fittings..  

zackcasemore16 zackcasemore16
I watched NASCAR once | Posts: 7 | Joined: 07/13
Posted: 07/17/13
07:19 PM

Did you try these?  

waynep712222 waynep712222
I’ve been to a few races | Posts: 56 | Joined: 04/13
Posted: 07/17/13
09:14 PM

he has not logged in since may 9th..  and has not updated anything..

since he has a web page over at facebook and i don't even want to start there.. we have no way to know if it helped him..

this increase of wheel cylinder piston diameter will exert additional force pushing the brake shoes apart.

the 3/4" cylinder has 0.441" of surface area.

the 7/8" cylinder has 0.601" of surface area.

thats almost 1/3 more hydraulic force to the rears with just that swap... for under 30 bucks ..

there is probably nothing stopping anybody from boring one out to 15/16 if you can find the correct pistons..  cup seals should be easily available.

there should also be nothing stopping one  from going billet. to 1.000 also..

i might if i was going to do that.. before i cut the flats on the sides... might thread the area.. so threads will be there to place a custom nut on..  although.. you might have to move the bleeder screw and the line fitting closer to center on the billet piece.  

zackcasemore16 zackcasemore16
I watched NASCAR once | Posts: 7 | Joined: 07/13
Posted: 07/18/13
02:53 PM

Alrighty thanks very much for the reply,

I have the same car with bigger brakes on the front and want to try more rear,
So I'm gonna order some and give it a try, which ones you think I should try, and what are they off of

Thanks a lot  

zackcasemore16 zackcasemore16
I watched NASCAR once | Posts: 7 | Joined: 07/13
Posted: 07/18/13
02:54 PM

Alrighty thanks very much for the reply,

I have the same car with bigger brakes on the front and want to try more rear,
So I'm gonna order some and give it a try, which ones you think I should try, and what are they off of

Thanks a lot  

zackcasemore16 zackcasemore16
I watched NASCAR once | Posts: 7 | Joined: 07/13
Posted: 07/18/13
02:55 PM

I have manual brakes  

waynep712222 waynep712222
I’ve been to a few races | Posts: 56 | Joined: 04/13
Posted: 07/18/13
09:22 PM

i also looked thru my wheel cylinder images.. the only other snap in type wheel cylinder was from an

1987 S10 blazer 2wd with manual brakes...  

bendix wheel cylinder number E139-71-021  

AutoZone# 33892 but this is only for the 2 wheel drive versions with MANUAL brakes...

oh... i looked over at oreilly.. it is a bendix 33892 there also..

post what brand your local stores carry .. or what the store chain is..

i will attempt to find you part numbers..



power brake versions get the same 3/4" wheel cylinder  so be sure that you check which ones they give you..

please ask for it by APPLICATION... if you give them a direct part number..  or say i want some 7/8" wheel cylinders instead of 3/4.. they are going to not want to sell them to you...



hmm. better hurry.. rock auto shows only 4 available.. 3 at 5 bucks each and one at 7 bucks...  33892... as its discontinued by bendix..


Part Number: 33892
Notes: Fits either side 7/8" diameter
Bleeder Screw Cap Included: No
Bleeder Screw Included: Yes
Brake Cylinder Bore Size/Sizes: 7/8"
Inlet Thread Size: 3/8-24
Installation Hardware Included: No
Material: Cast Iron

they are 10 bucks each and in stock at the auto zone hub store at zip code 90026 according to the online az site..  

zackcasemore16 zackcasemore16
I watched NASCAR once | Posts: 7 | Joined: 07/13
Posted: 07/19/13
02:48 PM

I live in Ontario and get my parts from ideal supply/ napa  

waynep712222 waynep712222
I’ve been to a few races | Posts: 56 | Joined: 04/13
Posted: 07/20/13
11:09 AM

Part Number: UP 37644
Product Line: NAPA Ultra Premium Brake Parts
Attributes:
Bore Size : 7/8"
Wheel Cylinder Line Thread Size : 3/8-24  

waynep712222 waynep712222
I’ve been to a few races | Posts: 56 | Joined: 04/13
Posted: 07/20/13
11:18 AM

don't let them sell you this one.. its 3/4" the same as what you have...

Part Number: UP 37535
Product Line: NAPA Ultra Premium Brake Parts
Attributes:
Bore Size : 16 mm
Wheel Cylinder Line Thread Size : 3/8-24  

waynep712222 waynep712222
I’ve been to a few races | Posts: 56 | Joined: 04/13
Posted: 07/20/13
11:21 AM

there is one wheel cylinder from napa with 11/16" bore and MAY HAVE the proper ends.. but the shape is slightly different.. the offset is wrong from above and there is no U shape to keep it aligned

but you could use the pistons and seals out of that one with a sleeve in a pair of cheep 3/4" versions to reduce the bore to 11/16 if you wanted to reduce

582002  

waynep712222 waynep712222
I’ve been to a few races | Posts: 56 | Joined: 04/13
Posted: 07/20/13
11:34 AM

oh.. and for others.. don't forget.. that bolt on wheel cylinders can also be found in various sizes.. that will interchange to fine tune the brake bias..  

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