Dunlop Caliper Quandry

[deeyesbee]

Now there's an odd thing.  My S 1 1/2 Berlina has got 1 5/8 Dunlop calipers on the front (haven't measured the rears yet) rather than 2 1/8.  Does anyone  know if they came like that or has someone been modifying my car dangerously?!
In other news, I failed to get the car ready for Goodwood although enjoyed the day in William's Flavia convertible.  The Flying Fridge itself is now stripped ready for painting and if only I could get the brakes to work I would be happy. The master cylinder rebuild went well though so I should be grateful for that!

[williamcorke]

Flavia, David, not Flaminia  

I wonder if the smaller wheel cylinder thing might be an Italian market / 4 speed spec.

[fay66]

Now there's an odd thing.  My S 1 1/2 Berlina has got 1 5/8 Dunlop calipers on the front (haven't measured the rears yet) rather than 2 1/8.  Does anyone  know if they came like that or has someone been modifying my car dangerously?!
In other news, I failed to get the car ready for Goodwood although enjoyed the day in my friend's Flaminia convertible.  The Flying Fridge itself is now stripped ready for painting and if only I could get the brakes to work I would be happy. The master cylinder rebuild went well though so I should be grateful for that!

According to my Dunlop/ Girling Catalogue 262 you should have 2.1/8" Front & 1.3/8" Rear.
The only Lancia usage for 1.5/8" is for the Flavia rear, & Flaminia Saloon & Coupe rears only.
All fronts are various versions of 2.1/8".
William My 2c is a four speed with the 1091cc engine and mine are the same as I've listed.

Brian
8227

[williamcorke]

Looks like someone used whatever was available, at some point (probably not when the car was originally built).  Are the fixing bolts positions the same for the different cylinder sizes?

[Richard Fridd]

I think so, but the piston assembly castings are different, rather than being a common casting with different bore sizes

[fay66]

Looks like someone used whatever was available, at some point (probably not when the car was originally built).  Are the fixing bolts positions the same for the different cylinder sizes?

Certainly not original.

Brian
8227

[chriswgawne]

Our GTE has always been serviced properly throughout its life and is fitted with 2 1/8" front cylinders. we also have a servo as standard.
New front and rear wheel cylibnders are available from Cavalitto and stainless steel versions are available elsewhere - I have details if anyone wants them.
You should change the fronts IMHO as your braking must be severkly compromised!
Chris

[deeyesbee]

Thanks everyone - very helpful responses.  I've emailed Cavalito Chris, thanks.  Brian I'm sure you're right. 

I will just check what the rears are.   This car is an in-between model (818 610 021 620) and has some peculiarities.  It's reassuring that Brian's GTE has the larger brakes though.  I will report back when I've had a proper look at the rears. 

Omicron said that someone could have put the fronts on the back and vv which is possible I suppose.  The main thing is that the fronts need to be bigger so a 1 3/8 back and 1 5/8 front combination might work (in theory).  My old 3.8 Mk2 Jag had the the 2 1/8 cylinders on the front, stopped well and must weigh twice as much as the Fulvia as well as being twice as quick!

[fay66]

Thanks everyone - very helpful responses.  I've emailed Cavalito Chris, thanks.  Brian I'm sure you're right. 

I will just check what the rears are.   This car is an in-between model (818 610 021 620) and has some peculiarities.  It's reassuring that Brian's GTE has the larger brakes though.  I will report back when I've had a proper look at the rears. 

Omicron said that someone could have put the fronts on the back and vv which is possible I suppose.  The main thing is that the fronts need to be bigger so a 1 3/8 back and 1 5/8 front combination might work (in theory).  My old 3.8 Mk2 Jag had the the 2 1/8 cylinders on the front, stopped well and must weigh twice as much as the Fulvia as well as being twice as quick!

I'd agree with Chris and suspect your brakes could be severley compromised and should be changed to 2.1/8" ASAP, not sure how much your Jag weighed in at, but the Fulvia Berlina weighs in at around a Ton, so it's no lightweight.
Omicrons surmise would appear to be a wrong assumption as it would never have been fitted with Either 1.5/8" or 1.3/8th to the front.
Just for interest I've just been looking up build for 818 610/612 and chassis numbers for 1970 ranged from 05305- 23318 so I suspect your Berlina was built about October November 1970.

[williamcorke]

FWIW, I'll go with Chris and Brian on this one.  Quite apart from the loss of braking efficiency, the incorrect front cylinders will presumbably change the balance so that the rear brakes are doing more of the work - risking a rear-brake lock-up.

[chriswgawne]

Many years ago in the late 70's because of non-availability of seals and wheel cylinders I fitted 28mm wheel cylinders to the rear of my 4th Series B20 because it was all I could obtain at the time.
Originally they were 22mm at the rear when the car was new and 28mm at the front (which up to 4th Series are single leading shoe fronts). Under enthusiastic braking on the road the rears locked up which was disconcerting to say the least and I remember at the time wondering if I might be better off without rear brakes!
Fortunately seals and cylinders became more readily available shortly afterwards and whilst I have 'played tunes' with various front/rear combinations on B20's (mainly with the front brakes where one can fit stepped cylinders), I have always fitted 22mm dia cylinders at the rear to single leading shoe braked cars. Where twin leading shoe brakes have been fitted I have gone up in size at the rear to 25mm without any problems of rear locking.
Chris

[deeyesbee]

The plot thickens...

Thanks Will for taking these photos. These are of the rear brakes of my Fulvia.  Anyone recognise the markings?