Raffi's 62 Brakes

[mopar2@xxxxxxxxxx]

I believe 61 was the last year for this type of booster.In 62, they went to the
round style.
John

David Sherratt wrote:

> The repair of the oval brake booster is quite simple.  However this must be
> conceived as only a temporary repair.
>
> The oval brake booster is a very simple piece of kit.  It is basically just
> a cylinder with poppet valves and a large neoprene diaphram and piston.  It
> is nine times out of ten the neoprene that wears.  The centre of the
> cylinder has a shaft that runs through the centre of the neoprene diaphram
> and piston.   If you disassemble an oval cylinder you will find all the
> poppet valves towards the front and a valve block that's held in position by
> two split pins or Salock pins as we call them in England.  If you remove the
> two pins you can slide the valve block off the end of the shaft and then
> remove the diaphram and piston.  If you inspect the diaphram where it is in
> contact with the shaft, you will find that it has worn.  The best way of
> describing it is that the contact edge of the diaphram should look like and
> oil seal with a raised edge on the internal diameter.   What I did with mine
> was to find an O ring and bond it with an epoxy resin to the diaphram so it
> made a new contact surface to the diaphram.  Also at this stage there is a
> nylon washer that also causes wear, you will need to check that.  Prior to
> reassembly I coated the shaft liberally with rubber grease thats used in
> brake cylinders, etc.
>
> Please bear in mind that this is only a temporary repair, even though the
> epoxy resin I used had a 1200 psi tension.  I repaired the brake booster 18
> months ago and its still working as good as new now..
>
> When the brake booster is disassembled, only use alcohol to clean the brake
> parts and poppet valves and the inside of the actual cylinder.
>
> Hope this is of help.
>
> Dave
> 60 Le Baron
> England
> -----Original Message-----
> From: mopar2@xxxxxxxxxx <mopar2@xxxxxxxxxx>
> To: mailing-list@xxxxxxxxxxxxxxxx <mailing-list@xxxxxxxxxxxxxxxx>
> Date: 13 April 2002 14:34
> Subject: Re: IML: Raffi's 62 Brakes
>
> >The combination of the hissing & rough idle suggests a vacumm leak.Check
> the
> >hoses from the booster to the manifold for possible leaks, if none there,
> it
> >could be the booster. Many have said that once brake fluid gets on the
> linings,
> >its impossible to remove it all & problems will result, but this doesn't
> sound
> >related to your current problem.
> >John
> >
> >Raffi Kondy wrote:
> >
> >> Hey list,
> >>
> >> I recently had my wheel cylinders replaced because the originals were
> >> leaking brake fluid, and my neighborhood mechanic, a very experienced
> >> mechanic at that, put them in but noticed a problem.  He said that when
> he
> >> tested the  brakes, after coming to a stop with the pedal fully engaged,
> the
> >> brakes seem
> >> to disengage a little, and the car moves forward slightly until you apply
> >> more pressure to the brake pedal.  He seems to think the problem might
> >> be in the brake shoes, which got a little wet from the brake fluid
> leaking
> >> on them, but which he cleaned and checked and seems to think are ok.  He
> >> believes that everything else is ok on the brakes.  I tested the car, and
> >> felt like the brakes are better now than whenever I had driven the car
> >> before (I have been driving it about 9 months now), but I did notice
> >> what he was talking about.  I don't think that this is dangerous, but it
> >> seems odd that when you push down on the brake pedal and the car stops,
> >> its as if you need to push down a second time to keep the car from moving
> >> slightly.
> >> I know I'm not doing a great job of describing this problem, because it
> >> really needs to be experienced to be understood.
> >>     Could the problem lie with the brake vacuum booster?  Maybe it leaks
> >> and doesn't give the full boost when you put your foot down on the pedal
> all
> >> the way.  It does seem to hiss a little when the car is in N and you
> >> push the pedal down all the way to the bottom.  Anyway, if you have ever
> had
> >> this problem, maybe you could help.
> >>
> >>     Also, I had the mechanic check the choke and the carb, the car wasn't
> >> idling properly, and he changed the idle speed to about 700, which seems
> >> a bit high according to specifications.  Is this unwise? It feels better
> >> than before. Thanks,
> >>
> >> Raffi in SF
> >> 62 Crown Coupe
> >>
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