Results 1 to 20 of 20

Thread: Bigger disc brakes for MM/D50

  1. #1

    Array
    Status
    Offline
    Join Date
    04-15-2011
    Posts
    66
    Location

    American Fork, UT
    Vehicle

    1987 Mitsubishi Montero
    Engine

    Other

    Bigger disc brakes for MM/D50

    It seems like a few MM/D50 owners are interested in finding an easy solution for bigger front disc brakes, and from what I gather no one has found one yet. I found one.
    I spent a good part of the day at the J/Y looking for options for bigger front brakes for my 87 D50 4x4. I found a great fit with parts from a Montero Sport. It comes stock with dual piston calipers, and 12-1/4" ventilated rotors. I had a 4x4 D50 and Montero Sport right next to each other, making it very easy to compare/test fit parts. The good news is it works very well with only 2 issues, both solved in an hour with minimal use of a grinder. The other solution is to switch to 16" wheels, which is expensive and requires larger tires, too.
    The hub and spindle are the same dimensions as my MM, even down to the bearings. I don't know if the Sport shares a lot of other components with the trucks, would be interesting to find out, but these parts work.

    These are the parts I took from the Montero Sport-
    1. hub/rotor
    2. caliper
    3. caliper bracket
    4. rubber brake line from caliper to union with metal line
    5. dust shield and bolts

    I'm doing this swap with my original, stock master cylinder, but if it doesn't work well I'll swap in the Sport master cylinder also. I think dual piston calipers have a greater volume of brake fluid, so it may be necessary to swap master cylinders, as I'll find out.

    The first issue is the dust shield, and there are 2 solutions-the four bolts that hold it to the knuckle are indexed, or rotated, about 3/4" compared to the Sport, and it interferes with the lower caliper bracket, so it either needs to be cut with tin snips or the four holes redrilled to line it up correctly. Easy fix. The second issue is more time consuming-with the stock 15" wheels the caliper body makes contact with the inside of the wheel, preventing it from seating flush with the hub. You can either switch to 16" wheels, or do some grinding, as I did. I have pictures to illustrate, but it is a minimal amount of grinding, and it all fits great now.

    Anytime you alter or modify brake components it should be done with care and common sense-mucking about with brakes can cause injury or death. So, with that in mind, let me hasten to state that the grinding involved is minimal, and no where near the piston bores or other sensitive areas. I took off less than 1/8" on the outer corners of the bracket and caliper itself, and am confident nothing has been compromised or made unsafe-the calipers bodies are pretty stout, as you can see in the accompanying photos.

    So, with that said, this looks like a practical, affordable solution to weak stock brakes, made worse by installing larger tires.

    Here are the photos-Click image for larger version. 

Name:	rotors.jpg 
Views:	442 
Size:	84.1 KB 
ID:	5158Click image for larger version. 

Name:	brackets.jpg 
Views:	282 
Size:	98.5 KB 
ID:	5159Click image for larger version. 

Name:	montero rotor.jpg 
Views:	271 
Size:	86.2 KB 
ID:	5160Click image for larger version. 

Name:	bracket grind.jpg 
Views:	234 
Size:	53.4 KB 
ID:	5161Click image for larger version. 

Name:	clearance.jpg 
Views:	150 
Size:	55.8 KB 
ID:	5162

  2. #2

    Array
    Status
    Offline
    Join Date
    04-15-2011
    Posts
    66
    Location

    American Fork, UT
    Vehicle

    1987 Mitsubishi Montero
    Engine

    Other
    Oops, forgot to include photos of the calipers-tomorrow, plus test drive report, if I don't die.

  3. #3

    Array
    Status
    Offline
    Join Date
    03-05-2012
    Posts
    99
    Location

    San Jose, CA
    Vehicle

    1983 Dodge Ram 50
    Engine

    4D55-T
    Anybody know if 1st gen spindles dimensions match 2nd gen spindle dimensions? If so, this could also bolt on to a 1st gen 4x.

    Natureboy, what year what year was the Sport? early 90's???

  4. #4

    Array
    Status
    Offline
    Join Date
    04-15-2011
    Posts
    66
    Location

    American Fork, UT
    Vehicle

    1987 Mitsubishi Montero
    Engine

    Other
    The montero sport was a 2000, 4x4 with the 3.0. I believe the spindles are identical between 1g and 2g 4x4 pickups.

  5. #5



    Array
    Status
    Offline
    Join Date
    03-20-2011
    Posts
    4,112
    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    All the parts on 1st and 2nd gen should be interchangeable - check for the parts for a 1st and 2nd gen at rock auto - if they are the same, then they interchange. Did that with a 91 accord and 92 prelude for fuel pump and other parts.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  6. #6

    Array
    Status
    Offline
    Join Date
    04-15-2011
    Posts
    66
    Location

    American Fork, UT
    Vehicle

    1987 Mitsubishi Montero
    Engine

    Other
    Looks like the wheel bearings are identical, so it should work. Just did a test drive-what a difference! Stopping power is impressive. Think I'm going to do the master cylinder just to keep it all the same system.

  7. #7



    Array
    Status
    Offline
    Join Date
    03-20-2011
    Posts
    4,112
    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    there is an article in street roder mag that does an excellent job of explaining the relationship of master cylinders to calipers and wheel cylinders and how a larger master cylinder bore gives more volume, but at less pressure, changing the feel of the brakes, and how to pick the right combination for your vehicle. It is a must read for anyone modding brakes - when I find the link I will post it.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  8. #8



    Array
    Status
    Offline
    Join Date
    03-20-2011
    Posts
    4,112
    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    Found a different article that is even better as it is geared for 4x4 vehicles - it is highly detailed: http://www.pirate4x4.com/tech/billavista/Brakes/
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  9. #9

    Array
    Status
    Offline
    Join Date
    04-15-2011
    Posts
    66
    Location

    American Fork, UT
    Vehicle

    1987 Mitsubishi Montero
    Engine

    Other
    Awesome! Thanks. I love technical info.

  10. #10

    Array
    Status
    Offline
    Join Date
    04-24-2011
    Posts
    305
    Location

    Orlando, FL
    Vehicle

    1990 Mitsubishi Mighty Max
    Engine

    G64B
    Thats setup i have been running for 5 years,the rotors wont work on a 2wd because of the offset on the 4wd rotors.
    http://www.mightyram50.net/vbulletin...=2388#post2388

  11. #11

    Array
    Status
    Offline
    Join Date
    04-15-2011
    Posts
    66
    Location

    American Fork, UT
    Vehicle

    1987 Mitsubishi Montero
    Engine

    Other
    did you have to do many mods to make it fit? After five years any problems with it?

  12. #12

    Array
    Status
    Offline
    Join Date
    04-24-2011
    Posts
    305
    Location

    Orlando, FL
    Vehicle

    1990 Mitsubishi Mighty Max
    Engine

    G64B
    no mods to fit just order a loaded caliper for a 92 montero, the loaded caliper comes with brake pads and new mounting bracket for the bigger calipers, no issue with this setup.

  13. #13

    Array
    Status
    Offline
    Join Date
    12-04-2012
    Posts
    496
    Location

    New Bern, NC
    Vehicle

    1994 Mitsubishi Mighty Max
    Engine

    4G64
    And those calipers work with stock 2wd mm rotors?

    That was to rahtid. His pics seem to be using mm rotors. Do the 4wd rotors from the monteros bolt up to the 2wd mm hubs?
    Last edited by recian; 04-22-2013 at 11:07 AM.

  14. #14


    Array
    Status
    Offline
    Join Date
    03-21-2011
    Posts
    777
    Location

    WA
    Vehicle

    1989 Mitsubishi Mighty Max
    Engine

    4G63-T
    I changed my rotors already. Need update to this thread so I can get bigger rotors. Please. Lol. 1989 MM 2wd.
    1989 Mitsubishi mightymax; 1990 4g63 6 bolt swap: malhe 9.0 pistons, eagle h beam rods, acl race bearings, rebuilt head, evo 3 16g, aem afpr, Maft, 3" gm maf blow through, walbro 255 fuel pump, hks ssq bov, fmic, coil over plug, FIC 750 injectors, dsmlink, apexi avcr, AEM eugo, s90 throttlebody, JMF FIAC block off plate. LT1 T56 in the works.
    Why a mightymax? Why not? 18 psi FTW.

  15. #15

    Array
    Status
    Offline
    Join Date
    03-05-2012
    Posts
    99
    Location

    San Jose, CA
    Vehicle

    1983 Dodge Ram 50
    Engine

    4D55-T
    4doorciv, No interchange from 2wd to 4wd. You're outta luck for brakes.

  16. #16

    Array
    Status
    Offline
    Join Date
    03-05-2012
    Posts
    99
    Location

    San Jose, CA
    Vehicle

    1983 Dodge Ram 50
    Engine

    4D55-T
    BTW, scored a set off a 2001 Montero Sport that came with factory 16's and those brakes are awesome looking and bolt right on the 4x spindles.

  17. #17


    Array
    Status
    Offline
    Join Date
    03-21-2011
    Posts
    777
    Location

    WA
    Vehicle

    1989 Mitsubishi Mighty Max
    Engine

    4G63-T


    Anyone find any canyon or Colorado in the pick and pull they can use as a comparison?
    1989 Mitsubishi mightymax; 1990 4g63 6 bolt swap: malhe 9.0 pistons, eagle h beam rods, acl race bearings, rebuilt head, evo 3 16g, aem afpr, Maft, 3" gm maf blow through, walbro 255 fuel pump, hks ssq bov, fmic, coil over plug, FIC 750 injectors, dsmlink, apexi avcr, AEM eugo, s90 throttlebody, JMF FIAC block off plate. LT1 T56 in the works.
    Why a mightymax? Why not? 18 psi FTW.

  18. #18


    Array
    Status
    Offline
    Join Date
    03-21-2011
    Posts
    777
    Location

    WA
    Vehicle

    1989 Mitsubishi Mighty Max
    Engine

    4G63-T
    Can I bolt on a 4x4 spindle? Lol.
    1989 Mitsubishi mightymax; 1990 4g63 6 bolt swap: malhe 9.0 pistons, eagle h beam rods, acl race bearings, rebuilt head, evo 3 16g, aem afpr, Maft, 3" gm maf blow through, walbro 255 fuel pump, hks ssq bov, fmic, coil over plug, FIC 750 injectors, dsmlink, apexi avcr, AEM eugo, s90 throttlebody, JMF FIAC block off plate. LT1 T56 in the works.
    Why a mightymax? Why not? 18 psi FTW.

  19. #19



    Array
    Status
    Offline
    Join Date
    03-16-2011
    Posts
    3,613
    Location

    Sacramento, CA
    Vehicle

    1979 Dodge D-50
    Engine

    Chevy V6
    I did find these rotors in the junk yard today. I didn't have a tape measure so I put my foot on one of them for sizing. I think only one is needed to stop the truck.
    Does anybody know if this conversion was finished?

    Click image for larger version. 

Name:	!cid__07-19-13_1019.jpg 
Views:	129 
Size:	37.1 KB 
ID:	6227
    Members come and members go, But the board keeps track of them.
    Check out the Fear Monger by
    clicking HERE.

    The MightyRam50 site is sponsored in part by On Site Concrete Inc.

  20. #20

    Array
    Status
    Offline
    Join Date
    08-11-2013
    Posts
    8
    Location

    washington
    Vehicle

    1988 Mitsubishi Mighty Max
    Engine

    G54B-T
    Do the auto hubs work on those monty set up? Any ideas on rear brakes? i have the 1 ton rear axle and the drums are 9x2"

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •