Renault Master Vac (On R16's) - Can be serviced?
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  1. #1
    Fellow Frogger! Sarosa's Avatar
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    Mar 2003

    Default Renault Master Vac (On R16's) - Can be serviced?

    Excited to be getting round to bleeding the brakes on my 16 restoration turned to an almost existential crisis yesterday as I pondered all the combinations of Master Cylinder and Master Vac's that came with the R16 over the years .
    First problem was trying to mate a series 2 vac with a 17.5mm master cylinder. I thought it was a series one vac because it had two mounting bolts (per early 16's) into the steering column. No, there are two, series 2!. One with two bolts and one with 4. Their rod's also look different but probably measure the same. So the series 2 vac appears to only mate with a single circuit 19mm master cylinder. I thought I'd try a 19mm tandem Master but Renault decided it would change the thread size on the rear brake line so it could not be threaded. I then incorrectly tried to mate it with another master cylinder marked suitable for TL 69-71 but that turned out to be a 20.6mm one. I can only assume early TL's (perhaps only in Europe were not fitted with a master vac?)or perhaps the info is just wrong and it only fitted a standard 1470cc Renault 16.


    Anyway the upshot is despite all the confusion I thinks I've sorted it. I do have a series 1 Master Vac (which would be original to a 69TS) however it appears to be in poor condition. The two Options I have are

    1. Use the Series' one Vac with it's 17.5mm Master
    2. Use the series 2 Vac (with early bolting pattern) and wait for the 19mm Master ordered off eBay to arrive in March!

    So enough meandering with background my question is what is actually in a Master Vac?, Can the be opened up and cleaned? The reason I ask is because the only early one I have has a lot of rust remnants fall out with a shake through the valve hole. It's not exactly a clean looking unit and was probably sitting somewhere for many years (Possible under water!), but it's the only one I have.

    See photo's for a snap inside the valve hole. It appears it could be opened up at the back if the two halves were turned in opposite directions. Is this correct? Cheers.
    Attached Thumbnails Attached Thumbnails Renault Master Vac (On R16's) - Can be serviced?-photo-1.jpg   Renault Master Vac (On R16's) - Can be serviced?-photo-2.jpg   Renault Master Vac (On R16's) - Can be serviced?-photo-3.jpg  

  2. #2
    Too many posts! JohnW's Avatar
    Join Date
    Jul 2001
    Perth, WA, Australia


    I have NO idea but I'll be very interested to read the answers. I didn't realize they'd changed so much.

    Good luck. It looks lovely by the way.

    Renault 4CV 1950 (R1062)
    Renault R8 1965 (R1130)
    Renault Scenic Series II 2005 (wife's)
    Renault Scenic Series II 2006 (daughter's)
    Renault Scenic Series II 2007 (mine)

    CitroŽn CX Pallas 1980 (moved on to new custodian)

    National Co-ordinator, Renault 4CV Register of Australia

  3. #3
    1000+ Posts
    Join Date
    May 2005
    Boonah Qld


    Look up Google. There was a place in Caboolture Qld. used to do it so perhaps there is some one in Melb. does as well. I have a faulty one out of 17G and was always going to take it there but never did as it is at least a 2 hour drive away for me. The 17G one is also a special double unit so finding a replacement would be difficult.

  4. #4
    1000+ Posts driven's Avatar
    Join Date
    Apr 2005


    Go to any reputable Brake Service centre and they will be able to help you out

  5. #5
    Moderator vivid's Avatar
    Join Date
    Mar 2002
    parallel 43į south


    Hi Sarosa,

    I have had a few crises everted using a mob called 'Better Brakes' in Bayswater VIC who have been there over 30 years.
    I highly recommend them, no job I have thrown at them have they yet refused.

    I've had brake lines made up in 1/2 an hour, various Renault brake calipers reconditioned by them.

    I am going to be attempting to drive my 69TS in a few months, and (safety first!!) I'll be looking at the brakes soon, if it requires order in parts, NOW. Thanks for the heads up!
    Powered by high grade French plutonium.

  6. #6
    Simon's Avatar
    Join Date
    Jul 2000


    Power Brakes at Gilles Plains in SA claim to be able to rebuild all types of boosters. From my experience with them, I would believe it. Try contacting them first, they are usually very helpful.
    1963 Renault R4 Van
    1964 Renault R4
    1967 Volkswagen 1300 Deluxe
    1969 Renault 8 Gordini 1300
    2002 Land Rover Defender Td5 130 - ex-CFA Region 4
    2005 Renaultsport Clio 182 Cup

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