Truck & Bus Forum Truck & Bus Forum
10:18
Welcome to the Truck & Bus Forums
Welcome!A very warm welcome to truckandbusforum.com, a completely FREE online community for people worldwide with an interest in vintage and modern trucks and buses.

Click here to go to the forums home page and find out more.
Please feel free to join by clicking HERE.

Go Back   Truck & Bus Forum > Truck Forums > Vintage Truck Discussion

Reply
 
Thread Tools
  #11  
Old 29th July 2020, 20:49
Opalminer72 Opalminer72 is offline  
Member
 
Join Date: Jul 2020
Location: Australia
Posts: 2
TK Bedford park brake

Jim.
Thank you I had a mate push and hold the broken air line in. You can see the piston slowly move to release the park brake just need now to get fitting for the air line
Lifted the back end up with a back hoe and wheels now spinning
You will need air pressure to get the hub off or adjust the brake shoes wind them off
Then use a puller to slowly work the drum off.
Reply With Quote
  #12  
Old 29th July 2020, 21:51
mylesdw mylesdw is offline  
Senior Member
 
Join Date: Mar 2013
Location: Christchurch
Posts: 118
Quote:
Originally Posted by RustRemoverJim View Post
... the rods push from the central mechanism and into the cylinder on the drums when the air pressure is applied.
Small detail but they are pull rods.
__________________
Cheers
Myles

TK restoration blog: http://www.mig-welding.co.uk/forum/t...dford-tk.43480
Reply With Quote
  #13  
Old 30th July 2020, 11:52
RustRemoverJim's Avatar
RustRemoverJim RustRemoverJim is offline  
Member
 
Join Date: Jul 2020
Location: Nantwich
Age: 55
Posts: 13
Images: 4
Push & pull

Got my parking brake mechanism on the bench this morning, when I apply air pressure the rods push outwards towards the hubs. Or they try to, needs some TLC. Having said that, I’ve only driven it 50 meters and the brakes were sticking. Is there 2 types? I’ve put a photo of mine. I got the hub off by disconnecting the park brake rods and rigging up a puller. The adjuster just span in the crown shaped gear, but it came off any way.
Attached Images
File Type: jpg 1C080149-F5B3-4C83-A8C9-B7043B60F88A.jpg (16.1 KB, 11 views)
File Type: jpg E515F0CD-FDA8-4677-9054-FBEE80D8E822.jpg (14.7 KB, 7 views)
Reply With Quote
  #14  
Old 30th July 2020, 21:59
mylesdw mylesdw is offline  
Senior Member
 
Join Date: Mar 2013
Location: Christchurch
Posts: 118
Looks pretty similar to mine but I think some TKs don't have air at all - vacuum brakes.

NB: rods are missing here
Attached Images
File Type: jpg P1020823.JPG (95.6 KB, 8 views)
File Type: jpg P1020825.JPG (102.2 KB, 7 views)
__________________
Cheers
Myles

TK restoration blog: http://www.mig-welding.co.uk/forum/t...dford-tk.43480
Reply With Quote
  #15  
Old 30th July 2020, 22:38
RustRemoverJim's Avatar
RustRemoverJim RustRemoverJim is offline  
Member
 
Join Date: Jul 2020
Location: Nantwich
Age: 55
Posts: 13
Images: 4
I have just realised that you the author of the blue tk restoration blog which I have been reading over the past few months and using as a source of info when I get stuck. Best bit of info on the internet about TKs that I have come across. (I’m just buttering you up before I ask a load of technical questions!).
Reply With Quote
  #16  
Old 30th July 2020, 22:49
mylesdw mylesdw is offline  
Senior Member
 
Join Date: Mar 2013
Location: Christchurch
Posts: 118
No problem, just ask away; I have a lot of pictures!

Truck is standing in the yard at the moment and I haven't driven it in a while. We had some sort of virus going round in the autumn and were not allowed to travel for a while.

This group has some very knowledgeable people on it

https://www.facebook.com/groups/1198517853610561
__________________
Cheers
Myles

TK restoration blog: http://www.mig-welding.co.uk/forum/t...dford-tk.43480

Last edited by mylesdw; 30th July 2020 at 22:53.
Reply With Quote
  #17  
Old 31st July 2020, 12:13
RustRemoverJim's Avatar
RustRemoverJim RustRemoverJim is offline  
Member
 
Join Date: Jul 2020
Location: Nantwich
Age: 55
Posts: 13
Images: 4
I’ve got one rear slave cylinder and shoe expander mechanism off and it appears obvious that the rollers need to be pulled up the wedges in order to expand the shoes. I have triple checked my set up and it pushes the rods when pressured. My set up must have been wrong before it seized up. I’m thinking what could be wrong how to correct it. Wedges are upside down? The rods go to the wrong side? or my pressure pot pushes when it should pull? Looking at your pressure pot (assuming it is not pressured) and the leaver positions, it looks like it will pull, is that so? Am I missing something simple or just confused.
I will have a fresh look at it next week, beach and booze this weekend.
Reply With Quote
  #18  
Old 1st August 2020, 10:15
mylesdw mylesdw is offline  
Senior Member
 
Join Date: Mar 2013
Location: Christchurch
Posts: 118
It sounds like it's working fine. When the handbrake is on, there is no air pressure and the spring brake pulls the rods, which pulls the wedge which expands the shoes applying the brakes. When the handbrake is off, the air pressure compresses the spring brake, which pushes the rods which pushes the wedge which releases the brakes.

For the handbrake the spring applies the brake and the air pressure takes the brake off. It's a fail-safe thing - when there is no air pressure the brakes come on.
__________________
Cheers
Myles

TK restoration blog: http://www.mig-welding.co.uk/forum/t...dford-tk.43480

Last edited by mylesdw; 1st August 2020 at 10:18.
Reply With Quote
  #19  
Old 6th August 2020, 15:05
RustRemoverJim's Avatar
RustRemoverJim RustRemoverJim is offline  
Member
 
Join Date: Jul 2020
Location: Nantwich
Age: 55
Posts: 13
Images: 4
Back on it today. Of course, that’s so simple but I just couldn’t see it. As my dad would say, ”you can’t see the wood for the trees”. I had wrongly assumed pressure = brakes on! I can just focus on the rust now. Lots of cleaning and painting in progress. Thanks.
Attached Images
File Type: jpg 898A3944-1413-431B-A727-6E43ED0CCB18.jpg (20.4 KB, 7 views)
File Type: jpg 74C40F11-1435-400B-870C-6C348FBEC38A.jpg (19.9 KB, 4 views)
Reply With Quote
  #20  
Old 6th August 2020, 20:26
mylesdw mylesdw is offline  
Senior Member
 
Join Date: Mar 2013
Location: Christchurch
Posts: 118
Looking good.

On the subject of spring brakes and dismantling them - don't.

(In case you didn't already know that)
__________________
Cheers
Myles

TK restoration blog: http://www.mig-welding.co.uk/forum/t...dford-tk.43480
Reply With Quote
Reply

Bookmarks



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 10:18.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.