john136070 Posted March 23, 2015 Share Posted March 23, 2015 HiAdvice needed please. I have new seals for fitting in the master cylinders of my herald 1360 but they are far too tight and don't slide in the cylinder. They are fitted with the grease supplied.Any ideas why they should be so tight.Thanks John Quote Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 23, 2015 Share Posted March 23, 2015 make sure the cylindr diameter and seals supplied are the same size there are mixes of 0.625" and 0.7 " cylinders on the our range of cars sound like you are fitting .07 into a .625 Pete Quote Link to comment Share on other sites More sharing options...
Casper Posted March 23, 2015 Share Posted March 23, 2015 0.625" kit should be SP1963, or variantC. Quote Link to comment Share on other sites More sharing options...
john136070 Posted March 23, 2015 Author Share Posted March 23, 2015 HiThanks for the quick reply.Thought they were all .625. Probably right in thinkin the seals I have are .7, they certainly seem to be to big. Will confirm size.John Quote Link to comment Share on other sites More sharing options...
glang Posted March 25, 2015 Share Posted March 25, 2015 Hello John,As an aside to your question, I have just replaced the brake master cylinder on my Vitesse with a 0.75" bore unit and the pedal feel has improved 100%. I had previously changed the seals in the original unit but it remained spongy so got a new one off eBay (Landrover unit at 12quid delivered) and love it. I dont know if its just down to the bigger bore or cos its new but at that price its not worth messing about with seal changes!Hope that helps, Graham Quote Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 25, 2015 Share Posted March 25, 2015 yes good value but up the bore from 5/8 to 0.7 will increase your pedal load the 0.7 was introduced when type 16 calipers were fitted as the .625/ 5/8" needed extra stroke to shift the volume of the larger piston'd calipersconversely replace a a 0.7 with a 0.625" will reduce pedal effort but increase your stroke/travelPete Quote Link to comment Share on other sites More sharing options...
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