5 replies to this topic

[sparkymae]

In the Haynes book, 69-01 it shows a small round filter on the shaft that they say is replaceable on the brake booster. Is this something that should be done just for maintenance? I can't seem to find anyone who sells them. Has any one ever replaced one? Thanks. On cars 89 on. I have a 90 998cc.

Edited by sparkymae, 13 November 2019 - 01:29 PM.

[nicklouse]

you can use some air filter foam.

[Spider]

The recommended Service interval for the Servo Filter is 24 000 miles, though in dusty conditions, I'd suggest a much shorter period.

 

In normal operation, every time the Brakes are released, some Air is drawn in through this Filter. It goes via a couple of Valves, through the Servo and then eventually to the Manifold and through the Engine. Neglecting this Filter can lead to increased upper cylinder engine wear.

 

Like you, I've not found this filters available as a separate service item, but they do come with Overhaul Kits.

 

Separately to this Filter, the Brake Component Manufactures and BMC / Leyland / Rover recommend replacing the Rubber components of the Brake System every 3 years / 40 000 miles. This would include the Seals in a Hydraulic type Servo. Thing is here, this Brake Service Interval also doesn't align with the 24 000 Mile recommended Service Interval of the Servo Filter, seems a water to buy a kit, just for the filter.

 

They are only a Foam type Filter (which isn't brilliant) and as Nick suggests, just cut a new one from some Filter Foam.

 

It this Filter Chokes and somehow seals, the Brakes will become slow to release or in the extreme, can lock on, however, they usually perish and fall out before they get this bad.

[sparkymae]

Thanks to both of you.

[bae1994]

Has anyone got a pic of this filter?

And would it come with a new servo unit?

( My Haynes book is buried at the minute)

[Spider]

I don't have any photos on file, I'm sorry, but I have these diagrams, if that's any help.

 

MKI and MKII Cooper S

 

 

The filter in these is located under 8 in that diagram and is very similar to the MKIII Cooper S and early 1275GT Models;-

 

Item 2 in that diagram.

 

 

Australian MKII and Clubman GT

 

 

Item No, 35

 

and finally, the late Rover Mini (I had to dig deep to find this one!)

 

 

Item 6