1. J.P. Langston Brake Retrofit
A detailed walkthrough of how Montalvo upgrades the capabilities of your Langston machine with a retrofit to Montalvo V Brakes

2. Langston Automotive Style Brakes and Langston Unwind Stands

3. First, verify your Langston machine number.
When ordering a Langston retrofit package your machine number is used to match brake bolt patterns and shaft types.

4. After receiving your V Brake(s), verify contents.
V300 Series brake spider assembly
Air Input
V308
V Brake Piston
Air Fittings & (Ø 1/4”) Piping
V Pistons & V Pads

5. To begin installation, attach fan cover mounting clips (3) to the back side of the spider plate.

6. Attach cover clips with supplied SHCS & Washers.
Verify that the edge of the clip does not protrude past the edge of the spider plate before tightening. You can use your finger to verify that the edge of the clip is flush with the spider.
Edge of spider
Edge of clip

7. Additional brake package components
V300 Series Fan Cover
Hub & Spacer
Brake with single air input
Mounting Studs – V300 Series
1/2-13 UNC Hex Nuts, (3) per stud
1/2-13 UNC Studs, (4) per brake

8. J.P. Langston Brake Input air line J P Langston friction module
J P Langston brake rotor

9. Uninstall your Langston brake by loosening the set screws and removing the friction module mounting pins to remove the friction module assembly.
Mounting pins
Set screws
J P Langston friction module

10. Pull out the 4 friction module mounting pins.

11. Remove the 3 M12 SHCS from rotor hub using 10mm allen wrench.

12. Save all shims for use with the new brake.
Check inside rotor hub and on the shaft end for additional shims

13. It is essential that all Shims are kept at their original position for use with your new V Brake.
Remove all grease and dirt from the shims
Damaged or broken shims should be replaced with new ones of equal thickness

14. After rotor hub is removed use an allen wrench to remove mounting plate bolts.

15. Carefully pull the mounting plate from the spindle arm without allowing the shaft/core chuck to drop back from the side.

16. Clean grease and dirt from the mounting plate.
Grease seal

17. Mark the mounting plate to identify the unwind position.

18. Prepare to remove and replace shaft seal, and then install new seals from mounting plate backside.
Prepared mounting plate
Mounting Plate Shoulder
Seal

19. Before installing seal into mounting plate, check that the ‘seal lip spring’ has not popped out.

20. Install new seal using Federal-Mogul P/N 417269 4.875 x 6.250 x 0.500.

21. The next step is to mark the Mounting Plate Hole locations using the Montalvo Supplied Drill Jig

22. Place the drill jig over the mounting plate and align the jig so that the ‘flat’ on the jig indexes to the ‘flat’ on the mounting plate.
Flat Index
Seal Index
New Seal
Flat Index
Drill Bushings
Counterbored
Side
Flat Index

23. Check to ensure each location to be punched is clear of existing mounting plate holes.
Remove jig and verify that punched locations clear mounting plate holes.
Verified locations
Ø1/4” Center Punch (4) Locations

24. Next, set up milling machine
Set machine for drilling and tapping 1/2-13 UNC holes, and drill holes for mounting studs (4 per plate).

25. Drill 27/64 Diameter (0.4219) thru (4) places
Note that thru holes are not close to existing mounting plate holes.

26. Clamp mounting plate to work surface and tap 1/2-13 UNC thru (4) places
1/2-13 UNC tap, (4) places

27. Replace mounting plate/seal assembly and tighten bolts

28. Insert spacer

29. Insert shims into new brake hub and align with clearance holes
Montalvo brake hub
Shims saved from old brake

30. Place hub at shaft end and hold M12 SHCS bolts in place at hub counter bore

31. Insert and tighten 3 M12x45 SHCS bolts thru hub and spacer into shaft
Note: Apply Pressure To The Back Side Of The Shaft While Tightening Bolts

32. Check shaft for rotation and axial movement
New seal may make rotation stiff until broken in.
Predrilled mounting plate
New grease seal
Hub
Spacer

33. Install 4 1/2-13 UNC Studs with hex nut into mounting plate
Wait to tighten the hex nuts until after the brake has been put on.
Visually insure stud end is behind hub shoulder
Hub shoulder
3/4” to 1” thread into plate

34. Thread a second 1/2-13 UNC nut on each stud before attaching the spider, and then slide Spider Assembly over the studs.
Second set Of 1/2-13 UNC hex nuts installed behind spider assembly

35. Make sure the friction pads are facing out.
Thread another 4 1/2-13 UNC hex nuts onto the stud ends to hold the spider in place
Make sure the friction pads are facing out.
Friction pad
Piston assembly
1/2-13 hex nut

36. Attach disc brake to hub over the index shoulder using 6 M8x35 SHCS
Montalvo V300 Brake Disc

37. Tighten the 1/2-13 UNC hex nuts to the mounting plate.
Hex nuts on either side of spider assembly
Be sure that stud does not contact brake disc

38. Adjust hex nuts until there is approximately 1/16” gap between friction pads and brake disc

39. Verify 1/16” gap all of the way around the disc
Check pad-disc gap with 1/16” shim and tighten out hex nut where necessary
Verify 1/16” gap all of the way around the disc
Outer hex nut

40. Run a power cable for the fan cover and replace the air input line with a Ø ¼” hose

41. Push Ø ¼” input air line through cover into push lock fitting
Brake cover

42. Assembled V-308 Brake with fan cover
Power to fan
Air input to brake
Ø1/4” diameter air line
Fan power from control arm

43. Run the fan power from each control arm
Note the air and power input orientation relative to the pick-up arm.
Air and Power inputs

44. Langston Model 380 Corrugator With Montalvo V308 Brakes
Done.
Langston Model 380 Corrugator With Montalvo V308 Brakes

45. Installation Overview
After removing old brake assembly:
Remember To Keep Old Shims At Each Unwind Stand
It Is Essential That All Shims Are Kept At Their Original Position For Use With The New Brake
Remove Mounting Plate
Install New Seal In Mounting Plate
Use Drill Jig To Align Mounting Holes
Use Punch To Mark (4) Locations
Drill (4) Holes For Mounting Studs
Tap Holes For 1/2-13 UNC
Replace Mounting Plate
Insert Spacer
Mount New Brake Hub With Old Shims
Tighten Hub While Supporting Shaft
Thread (4) Studs With Nuts Into Mounting Plate
Slide V308 Spider Assembly Over Mounting Studs
Attach Brake Disc To Hub Using (6) M8x35 SHCS
Verify That Stud Does Not Contact Brake Rotor
Adjust For 1/16” Gap Around The Brake Assembly