I?ve never had any luck with the Mity-Vac, it always seemed to introduce more
bubbles than it took out. The pump-open-bleed-pump method works well for me,
though I need an assistant to work the pedal.
Two additional thoughts, if you?re in the mood to buy gadgets, gewgaws and
jimcracks:
1. Years ago, when bleeding the brakes on my MGB, I borrowed a device from a
friend. Made by Gunson (of Colourtune fame), it was a pressure-bleeder that you
fit to the top of your master-cylinder reservoir, allowing you then to go to
each wheel in turn and simply open the bleed nipple and the old fluid drained
out.
The only caution is that, as with the pump-and-bleed method, you need to keep
an eye on brake-fluid level to make sure you don?t introduce air into the
lines. As I cast my mind back, the Gunson gadget had an intermediate chamber
that you filled with brake fluid, and it pushed THIS into your master cylinder.
I think. Anyway, it made short work of bleeding brakes, and if I hadn?t blown
every penny on race-car bits for the E Prod MGB, I would have bought one.
2. Another friend bought and installed a set of SpeedBleeders a few years ago.
These are normal-looking brake bleed nipples, but the secret is internal: they
have a check valve which prevents air (or anything else) from being sucked back
into the system. Bleeding the brakes with these is simple: raise the car on
jacks, remove wheels, affix a bleed tube and dirty-fluid reservoir to the
nipple, loosen it 1/4 turn, then pump the brakes till you see clear fluid
through the hose. In theory you could do all four at once, if you had enough
drain hose and reservoirs. I bought a set of these for the Alfa but haven?t
installed them yet; I can?t imagine them not having them in T Series thread
size. If I were shopping, I?d Google Speedbleeder MG TD and it would send me
here:
http://www.speedbleeder.com/automobile_applications.htm#MG
Looks like their part SB3820 is the right one.
I will be flushing the fluid in the TD soon, because a) I have no idea when it
was last done, and b) I need to adjust the brake shoes ? the brakes work great
but there is a longish pedal travel. And now that I?ve installed the Lucas
Sport coil, the TD is running beautifully and is in regular use. We drove it
today to brunch and a quick shopping trip. I?m loving it.
Safety Fast,
?Scott Fisher
On Jun 15, 2015, at 11:06 AM, Richard Lindsay <richardolindsay@gmail.com> wrote:
> Getting near time to charge and bleed my TD's new brakes. I know to start at
> the longest pipe run and sequence to the shortest, then do it again, but...
>
> ...is it better to bleed via the old school pump-open-bleed-close-pump... way
> or to pull the fluid through with vacuum? I have a MityVac. Your advice?
> Thanks.
>
> -rick
>
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