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Front Disc Brake Kit GM Metric/Mustang II to 1949-54 Chevy, 5 on 4-1/2

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Specs
Sold in Quantity:
Kit
Bolt Pattern:
5 on 4.5"
Finish:
Natural
Caliper Finish:
Natural
Rotor Construction:
Vented
Material Type:
Cast Iron
Caliper Pistons:
Single
Rotor Diameter:
9.25
Rotor Location:
Front
Rotor Shape:
Round
Thread Pitch:
1/2"-20
Hardware Included:
Yes
Drilled:
No
Slotted:
No
Centerline of Holes:
5.50
Stud Length:
1.25
Stud Diameter:
.50
Rotor Thickness:
.88
Notes
Includes rotors, bearings and seals, calipers, pads, brake hoses, brake tabs, and caliper brackets.
Front Disc Brake Kit GM Metric/Mustang II to 1949-54 Chevy, 5 on 4-1/2
Front Disc Brake Kit GM Metric/Mustang II to 1949-54 Chevy, 5 on 4-1/2
VIDEO
Front Disc Brake Kit GM Metric/Mustang II to 1949-54 Chevy, 5 on 4-1/2

Click image to enlarge

Watch the video below to learn how to correctly measure your wheel bolt pattern.

Please note the following about this product:

  • This item is sold as a kit.

Details

Reviews (2)

Q & A (5)

What's in the Box

Info

An economical, lightweight brake kit for 1949-54 Chevy car spindles. Your stock Chevy spindles must be machined, or use Speedway '49-'54 Chevy-style spindles. This kit uses 9-1/4" Mustang II vented rotors with common GM metric calipers.

  • Typically used on Model T and Model A to 1936 Ford front ends 
  • For use on street rod tube front axles when using 1949-54 Chevy style spindles  
  • Will not work with stock 1949-54 steering arms 
  • Not to be installed on stock 1949-54 Chevy vehicle front ends

910-31955 Instructions (PDF)

Notes

  1. Clearance between king pin axle boss and caliper bracket must be checked upon installation. If interference is found, the edge of the bracket will need to be clearanced/machined to allow for sufficient clearance though the complete turning radius.

Customer Reviews

Rated 3.5 out of 5 by 2 reviewers.
RATING BREAKDOWN
2 reviews
5 Stars
0
4 Stars
1
3 Stars
1
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

Hemi tbucket
Verified Purchaser
Verified Reviewer
Sonora CA

great for t bucket, small amount of fitting required

June 30, 2015
A good kit. I upgraded a t-bucket from spindle mount wheels to five lug rotors. The kit has all the little parts so you shouldn't have to scrounge much. Note that if your spindles are not already machined, I recommend purchasing Speedway's already prepared ones. Since mine were already chromed and I have some machinist skills, I did my own. There is tig welding and routine lathe work. Everything was OK until time to thread the spindle for the wheel bearing nut. It is an oddball thread size, and the die to cut 3/4-20 thread can be hard to find. Otherwise, only normal common sense assembly results in very good brakes. If you buy new spindles, get the ones with fitted king pins and bushings.
Pros:
  • very complete kit
Cons:
  • A Little Fitting To Make
Yes, I recommend this product.
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Was this review helpful? 0 0

gasserhotrods
Verified Purchaser

Disc brake kit

March 13, 2014
This kit fits better than the Mustang 2 kit, but neither one is correct, I returned the Mustang 2 kit and had lots of conversation with Bill (one of your techs) and sent him pictures of the problem. The problem with the Mustang 2, kit is it does not follow the arc of the rotor, at one end the pad is completely on the rotor and at the other end the pad hangs off the rotor about 3/8" you can verify this with Bill. The GM kit has a bigger pads and the callipar is 90 degree to the rotor so you do not have the arc issue but the pads hang off the rotor about 3/8" also. My only complant is if I am buying a product like this I expect it to be correct and fit correctly. I think you should let customers know this up front that they do not fit correctly. I have bought several disc brake conversions kits over the years and never had this type of issue. I also think you should talk to your manufactures and see if they can correct the problems. Anyway that is my gripe of the day. Thanks Phil
No, I would not recommend this product.
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Merchant Response:

Thank you for your feedback. Please note that these brake kits do indeed carry the aspect that the caliper and pad location relative to the rotor face are not a matched arc, however from a function standpoint, our brake kits will fully function as intended and they still provide a better engineered brake system than the original Ford/Mustang II caliper design. We apologize for any dissatisfaction with any of our products, and we will gladly accept return/exchanges on these items as long as they still fit the warranty/return requirements.
Page 1 of 1

Product Q&A

5 questions : 5 answers

1 answers

Will this kit work with stock Mustang II rotors with 4 on 4 1/4" bolt circle? Building a narrow, small, light car which will use the 13" diameter stock 5" wide Mustang II wheels. Will the calipers used in this kit fit within these stock wheels? Will these calipers mount behind the axle? If so, will they clear the steering arms and 4-bar link mounts used on a 4" or 6" dropped tubular axle with 40" tread width? If this kit won't work for this application, which kit would work?

carcrazy
April 12, 2014

Will this kit work with stock Mustang II rotors with 4 on 4 1/4" bolt circle? Building a narrow, small, light car which will use the 13" diameter stock 5" wide Mustang II wheels. Will the calipers used in this kit fit within these stock wheels? Will these calipers mount behind the axle? If so, will they clear the steering arms and 4-bar link mounts used on a 4" or 6" dropped tubular axle with 40" tread width? If this kit won't work for this application, which kit would work?

Answers

April 14, 2014
EricM
The metric rotor in this kit extends further from the rotor than the original Mustang II calipers and for wheel clearance you would need a wheel with the I.D. in the area of the caliper approximately 12.25 to 12.5”. Verify the dimension of your wheel to make sure you will have clearance.
1 answers

Will this kit fit 49-54 pickup spindles

Rodhead
March 21, 2014

Will this kit fit 49-54 pickup spindles

Answers

March 25, 2014
EricM
This kit has a bracket that could possibly be modified to be used with your pickup spindles but they would need rather extensive machine work. We do have kit number 91031916 that will bolt on your pickup spindles with no machine work to the existing spindle. It also has larger 11” rotors for better stopping power.
1 answers

Need to replace wheel studs with 3 inch ones. Need Knurl info. Putting 10 spoke rocket wheels and need longer studs. Racing requirement for open end lug nuts. What knurl width and knurl depth studs for these rotors. 1/2 diameter. Kit number is 910-31955 Mustang II rotors Charlie

Hoss
February 23, 2014

Need to replace wheel studs with 3 inch ones. Need Knurl info. Putting 10 spoke rocket wheels and need longer studs. Racing requirement for open end lug nuts. What knurl width and knurl depth studs for these rotors. 1/2 diameter. Kit number is 910-31955 Mustang II rotors Charlie

Answers

February 24, 2014
EricM
The rotors in this kit use studs with .560" knurl diameter and .500" knurl length.
1 answers

what accessories work with this do you carry a kit to work with a 1934 1/2 ton chevy p/u original axel and spindles ? or will your 49-54 spindles work on my axel along with this brake kit . thnx

34leep
Texas, USA
December 11, 2013

what accessories work with this do you carry a kit to work with a 1934 1/2 ton chevy p/u original axel and spindles ? or will your 49-54 spindles work on my axel along with this brake kit . thnx

Answers

December 12, 2013
EricM
This brake kit will not work on your '34 half ton pickup. The '49 to '54 spindles cannot be swapped onto your '34 axle because of 3 ¼ degrees difference in camber built into the axle and spindles. Sorry we do not have a kit for your '34 Chevy pickup.
1 answers

Can this be used on an I-Beam axle?

Don
Charlotte, NC
February 08, 2016

Can this be used on an I-Beam axle?

Answers

February 09, 2016
Zach
Expert
Yes this kit is meant for our gasser solid axles and modified Chevy spindles
Page 1 of 1

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