Author Topic: Booster change to run Volvo 240 (four-pot) calipers?  (Read 1660 times)

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Alfetta77

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Booster change to run Volvo 240 (four-pot) calipers?
« on: July 03, 2021, 04:26:01 PM »
Hi everyone, would the standard brake booster fitted to and Alfetta GTV be ok to run Volvo 240 calipers, or is a different / upgraded unit required? Thanks in advance for any advice.
Current:  Alfetta GTV 1977 Silver
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LukeC

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #1 on: July 03, 2021, 08:35:29 PM »
It's not the brake booster that is the issue.

By the letter of the law, a brake upgrade such as this requires and engineering certificate. If the volume of displacement of fluid in the replacement callipers (simple schoolboy maths i.e. area of two pistons versus area of single piston) is significantly greater than the original calliper, then a proportional increase is generally in area is required in the master cylinder. This is to ensure there will not too much brake travel and pedal effort will remain similar. This is stipulated in VSB 14 (National code of practice for modified vehicles).

I converted my front brakes to GTA 305 mm discs and 4 pot Brembos when I did my 3.2 conversion. I changed the master cylinder from a 22 mm to a 24 mm. Sailed though the brake test.

But I can still get them to fade on a hard run...  :o
Luke Clayton

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Alfetta77

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #2 on: July 03, 2021, 09:04:53 PM »
Cheers Luke, that makes sense.
Current:  Alfetta GTV 1977 Silver
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SimonR

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #3 on: July 04, 2021, 12:37:31 PM »
I changed my 1984 2.0 GTV to Volvo 240 calipers along with larger 184mm Alfa164 vented discs and did not change anything else and it is all working fine,  we did discuss the possibility of adding a proportional valve inside the cabin however it does not appear necessary at this stage. Brakes are now significantly better than the prior Brembo Alfa 75 upgrade that was done years earlier.
1973 Alfa Spider - Red
1984 GTV 2.0 - White

Anth73

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #4 on: July 04, 2021, 03:23:42 PM »
My GTV has run the Volvo dual pot brakes with the standard master cylinder without problems. The brakes are powerful despite some initial softness in the pedal.

I'm upgrading to GTA 305mm ftont brakes just like LukeC. Current thinking is to try the standard master cylinder.

Luke - which car did your 24mm master cylinder come from?
« Last Edit: July 04, 2021, 09:25:51 PM by Anth73 »

Alfetta77

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #5 on: July 04, 2021, 07:21:13 PM »
Thanks Simon and Anth, sounds like it will be straightforward.
Current:  Alfetta GTV 1977 Silver
Previous: Alfetta GTV 1980 Red

LukeC

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #6 on: July 05, 2021, 07:03:34 PM »
Quote
which car did your 24mm master cylinder come from?

Hmmm: Some type of Mercedes Benz. I think a W116 series V8. The ports are on the other side so there is some line work to be done.
Luke Clayton

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GTVeloce

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #7 on: July 06, 2021, 01:06:27 PM »
Isn't the 164 MC 24mm? Or maybe 23mm? I recall it is bigger anyway!

Duk

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #8 on: July 06, 2021, 01:28:18 PM »
My 75 had a good pedal with a standard MC and the Volvo 4 piston calipers.
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rowan_bris

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #9 on: July 06, 2021, 01:58:40 PM »
I used a 25 mm cylinder with Giulietta QV calipers on a GTV6.  It is an ATE cylinder which comes on a BMW 750

Anth73

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #10 on: July 07, 2021, 09:52:59 AM »
I used a 25 mm cylinder with Giulietta QV calipers on a GTV6.  It is an ATE cylinder which comes on a BMW 750

Was that a drop-in replacement? If so I'd like to know the specific model of master cylinder for my own Brembo 305mm upgrade.  :)

rowan_bris

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #11 on: July 07, 2021, 10:54:45 AM »
There was a bit of work on the pipes but nothing too hard.  I donít have the number handy but will have a look

rowan_bris

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #12 on: July 08, 2021, 11:53:57 AM »
It was for an E32 BMW - Ate 010210

Alfetta77

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #13 on: July 28, 2021, 05:07:51 PM »
Hi Rowan, were you able to use the Alfetta reservoir, or did you have to use the BMW one? Have tried to look up dimensions / technical drawing of the Ate 010210 but haven't had any luck.
Current:  Alfetta GTV 1977 Silver
Previous: Alfetta GTV 1980 Red

rowan_bris

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Re: Booster change to run Volvo 240 (four-pot) calipers?
« Reply #14 on: July 28, 2021, 08:13:17 PM »
I used a BMW one