Front brakes

Technical questions and answers
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Finn1
Posts: 20
Joined: Thu Jun 20, 2019 8:47 pm

Front brakes

Post by Finn1 » Fri Aug 02, 2019 8:10 am

One of the front wheel cylinders leaked so I bought a rebuild kit for the front axles (rear too) and fitted the cylinders & shoess only to find the hub wouldn’t go on. Suffice to say it seems to have standard 109 front brakes, I re-assembled the brakes with the old shoes. Having seen the size of those brake shoes I’m pretty keen to get it back to V8 Brakes.
The wheel cylinders seem to be different to 4cyl according to the parts manual and they went on OK, as did the shoes.

So, the questions are:
1, Are these V8 back plates? They look like the ones in the pic on Craddocks site, but neither 4cly or V8 that are drawn in the parts manual.

2, If I get the correct drums I’m it appears that they won’t sit on the drive Drive flanges correctly, sitting maybe 15mm outboard of the flange. Is the difference taken up in the drum itself? It looks like the same part number for the spacer between the back plate and the axle on the V8 as 109. Somehow I need move the back plate inboard by the correct distance to allow for the wider drum & shoes. It looks like the hub assembly is different for the V8 but The part number for the hub/drive flange is the same for 109 & V8. The actual front axle casing has a diff engine part number so, is it narrower than the 4cyl? The back plate really needs to move inboard or the front track will widen. I’m a but confused as to where the difference lies.

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map1275
Posts: 928
Joined: Mon Jul 21, 2008 2:48 am
Location: Brisbane, Australia

Re: Front brakes

Post by map1275 » Fri Aug 02, 2019 10:26 pm

Do your wheel cylinders have mounting studs or holes for bolts?
Alternately, what is the bore diameter of the cylinders?

What is the diameter of your drum (measured across wear the shoes run)? It will be 10 or 11".

Genuine GIRLING backplates bare a manufacturer's part number stamped in. Though they are handed, they don't include this marking.

Six cylinder front brakes are larger in diameter and have wider shoes and drums than four cyl.

Rear is common with 110.

Finn1
Posts: 20
Joined: Thu Jun 20, 2019 8:47 pm

Re: Front brakes

Post by Finn1 » Sat Aug 03, 2019 1:09 pm

map1275 wrote:
Fri Aug 02, 2019 10:26 pm
Do your wheel cylinders have mounting studs or holes for bolts? Bolts
Alternately, what is the bore diameter of the cylinders? Dunno

What is the diameter of your drum (measured across wear the shoes run)? It will be 10 or 11". Dunno. It’s a bit difficult to measure them in situ but wider V8 shoes fit fine on the back plate and the drum goes over them ok. (Diameter wise)

Genuine GIRLING backplates bare a manufacturer's part number stamped in. Though they are handed, they don't include this marking. I can’t see anything but will tidy them up with a wire brush and have another look.

Six cylinder front brakes are larger in diameter and have wider shoes and drums than four cyl. I was under the impression that a 4 cyl. 109 had 11" front brakes over 10" on the 88.

Rear is common with 110.

disco2hse
Posts: 1506
Joined: Sun Apr 27, 2008 3:51 am
Location: Auckland NZ

Re: Front brakes

Post by disco2hse » Tue Aug 13, 2019 5:21 am

The back plate looks like the right one.

The drum diameter is 11" and the shoes are 3" wide. The drum is also larger on the V8.
Alan

1983 ex-army FFR 109 Stage 1
2005 Disco 2 HSE TD5

Finn1
Posts: 20
Joined: Thu Jun 20, 2019 8:47 pm

Re: Front brakes

Post by Finn1 » Sat Aug 17, 2019 9:20 pm

In a recent job lot of V8 parts I bought there a 2 sets of back plates which are the same as the ones I have and some drums. The difference I’m on about is in the profile of the drum. The 4 cyl drum has a chamfer on the edge where the V8 one has a square edge With the o/a depth of the drums being the same. It looks like I just need to put on the V8 pads and drums and the job’s a goodun. :D

disco2hse
Posts: 1506
Joined: Sun Apr 27, 2008 3:51 am
Location: Auckland NZ

Re: Front brakes

Post by disco2hse » Sun Aug 18, 2019 2:22 am

Oh yes. Forgot about that.
Alan

1983 ex-army FFR 109 Stage 1
2005 Disco 2 HSE TD5

map1275
Posts: 928
Joined: Mon Jul 21, 2008 2:48 am
Location: Brisbane, Australia

Re: Front brakes

Post by map1275 » Sun Aug 18, 2019 3:21 am

So have you actually purchased correct 6 cyl. front brake parts (drums, shoes and cylinders) and tried fitting them?

Finn1
Posts: 20
Joined: Thu Jun 20, 2019 8:47 pm

Re: Front brakes

Post by Finn1 » Tue Aug 20, 2019 5:48 pm

I've not tried to fit them yet. Hopefully I'll have a look at it in the next couple of weeks.

DanMif
Posts: 2
Joined: Thu Feb 28, 2019 9:45 am

Re: Front brakes

Post by DanMif » Sun Sep 29, 2019 7:38 pm

Hello, how did the fitting go? am considering doing this job sometime soon so would love to know any top tips.

Also, do you guys have any recommendations on front drums and pads please?

Thanks in advance

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Geoff
Posts: 532
Joined: Sat Oct 29, 2011 2:21 am
Location: Leicester UK

Re: Front brakes

Post by Geoff » Sun Sep 29, 2019 10:43 pm

I recommend fitting brake shoes to drum brakes.
2 1981 Stage One 109 V8 SWs
Image

DanMif
Posts: 2
Joined: Thu Feb 28, 2019 9:45 am

Re: Front brakes

Post by DanMif » Mon Sep 30, 2019 3:17 pm

hehe, you're right! :lol:

I'm looking around for new drums. geez they're expensive! anyone had any experience with the Britpart drums? would really hate to spend 200 euros to then end up with just a very big paperweight

Cheers

map1275
Posts: 928
Joined: Mon Jul 21, 2008 2:48 am
Location: Brisbane, Australia

Re: Front brakes

Post by map1275 » Mon Sep 30, 2019 7:01 pm

As far as I can discern, all the repros are from one mystery manufacturer, so buy from whomsoever is selling them cheapest.

disco2hse
Posts: 1506
Joined: Sun Apr 27, 2008 3:51 am
Location: Auckland NZ

Re: Front brakes

Post by disco2hse » Mon Sep 30, 2019 7:20 pm

Have had new front drums for about a year now. Seems to be ok so far.
Alan

1983 ex-army FFR 109 Stage 1
2005 Disco 2 HSE TD5

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