JB7, JD7, or JB8

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

coachdtierney54

Full Access Member
Joined
Mar 19, 2017
Posts
106
Reaction score
14
Location
US
First Name
Dan
Truck Year
1985
Truck Model
C30
Engine Size
454
You must be registered for see images attach




Sent from my XT1254 using Tapatalk
 

coachdtierney54

Full Access Member
Joined
Mar 19, 2017
Posts
106
Reaction score
14
Location
US
First Name
Dan
Truck Year
1985
Truck Model
C30
Engine Size
454
These are my front brakes I think I bit off more than I can chew...

Sent from my XT1254 using Tapatalk
 

CSFJ

-----------------
Supporting Member
Joined
Jul 1, 2014
Posts
6,160
Reaction score
5,170
Location
------
First Name
-------------
Truck Year
-------
Truck Model
-------
Engine Size
-------
looks as though the brake pad is doing a little home machine work on that rotor. A decent manual should walk you through removal and reinstall, the only catch is those things are ungodly heavy.
 

coachdtierney54

Full Access Member
Joined
Mar 19, 2017
Posts
106
Reaction score
14
Location
US
First Name
Dan
Truck Year
1985
Truck Model
C30
Engine Size
454
So new rotors are needed?

Sent from my XT1254 using Tapatalk
 

CSFJ

-----------------
Supporting Member
Joined
Jul 1, 2014
Posts
6,160
Reaction score
5,170
Location
------
First Name
-------------
Truck Year
-------
Truck Model
-------
Engine Size
-------
Depends on how long it's been grinding. These old trucks came with a lot of meat on those rotors, but without taking a mic to it to get a proper measurement, you can't say. first step in either situation though, will be to get the hub off.
 

coachdtierney54

Full Access Member
Joined
Mar 19, 2017
Posts
106
Reaction score
14
Location
US
First Name
Dan
Truck Year
1985
Truck Model
C30
Engine Size
454
You must be registered for see images attach


Sent from my XT1254 using Tapatalk
 

coachdtierney54

Full Access Member
Joined
Mar 19, 2017
Posts
106
Reaction score
14
Location
US
First Name
Dan
Truck Year
1985
Truck Model
C30
Engine Size
454
Is this enough? Sorry but I'm very new to this...

Sent from my XT1254 using Tapatalk
 

CSFJ

-----------------
Supporting Member
Joined
Jul 1, 2014
Posts
6,160
Reaction score
5,170
Location
------
First Name
-------------
Truck Year
-------
Truck Model
-------
Engine Size
-------
A tape isn't going to be accurate enough. most of the service limits are measured in the hundredth, or thousandth of an inch. You'd need to get a micrometer on it to get a real measurement from the thinnest points of the rotor, or take the rotor to where you'd have it turned and let them measure it.
 

coachdtierney54

Full Access Member
Joined
Mar 19, 2017
Posts
106
Reaction score
14
Location
US
First Name
Dan
Truck Year
1985
Truck Model
C30
Engine Size
454
Gotcha. Thanks for the info. After pricing these, I hope they can be saved. Even rockauto had them for about $100 each...

Sent from my XT1254 using Tapatalk
 

coachdtierney54

Full Access Member
Joined
Mar 19, 2017
Posts
106
Reaction score
14
Location
US
First Name
Dan
Truck Year
1985
Truck Model
C30
Engine Size
454
What tools do I need to remove it?

Sent from my XT1254 using Tapatalk
 

CSFJ

-----------------
Supporting Member
Joined
Jul 1, 2014
Posts
6,160
Reaction score
5,170
Location
------
First Name
-------------
Truck Year
-------
Truck Model
-------
Engine Size
-------
you're going to need to get a service manual for your truck. I don't have anything here that covers the c30 front brakes, and most videos on line seem to cover the k30 fronts. I've never played with the dually trucks, so I don't have a definitive answer on what you'll need, I can only guess and make assumptions based on other stuff I've worked on.
 

chengny

Full Access Member
Joined
Feb 22, 2012
Posts
4,086
Reaction score
1,023
Location
NH
First Name
Jerry
Truck Year
1986
Truck Model
K3500
Engine Size
350/5.7
Rotor thickness specs (as new, minimum machinable, and discard) for the various JB classes:


You must be registered for see images attach
 

Attachments

  • brake.jpg
    brake.jpg
    90.9 KB · Views: 194

chengny

Full Access Member
Joined
Feb 22, 2012
Posts
4,086
Reaction score
1,023
Location
NH
First Name
Jerry
Truck Year
1986
Truck Model
K3500
Engine Size
350/5.7
Gotcha. Thanks for the info. After pricing these, I hope they can be saved. Even rockauto had them for about $100 each...

Sent from my XT1254 using Tapatalk

See the post directly above for the thickness below which they cannot be machined. Also the minimum thickness for machining should be stamped somewhere on the rotor.
 
Last edited:

chengny

Full Access Member
Joined
Feb 22, 2012
Posts
4,086
Reaction score
1,023
Location
NH
First Name
Jerry
Truck Year
1986
Truck Model
K3500
Engine Size
350/5.7
What tools do I need to remove it?

Sent from my XT1254 using Tapatalk

Below is some info on 1985 C30 front brake maintenance. I hope they are legible.


Caliper R & R and brake pad renewal:


You must be registered for see images attach
You must be registered for see images attach



Rotor R & R:

You must be registered for see images attach
You must be registered for see images attach
 

Attachments

  • 1.jpg
    1.jpg
    99.1 KB · Views: 174
  • 2.jpg
    2.jpg
    97.8 KB · Views: 186
  • 3.jpg
    3.jpg
    62.4 KB · Views: 182
  • 4.jpg
    4.jpg
    92.6 KB · Views: 161

Forum statistics

Threads
44,057
Posts
948,515
Members
36,124
Latest member
dabsRus420
Top