Trunnionless front end

[Mark Hammond]

Before I drop my fast road engine into the Herald I thought it might be an idea to update the brakes and suspension first.  Firstly, I need to uprate to front discs and presumably the drum front uprights aren't suitable for disc brakes?  If so, I may consider CC trunnionless uprights.  Does anyone recommend this?  What is needed to change to discs? If I recollect, the engine valences are different, something to do with the way the brake hoses fit.  Apart from the calipers, discs, hubs and possibly the uprights, what else needs to change?

Thanks in advance.

Mark

[Davemate]

I can't think of anything else you would need.

[heraldcoupe]

You can fit discs to the drum uprights, this is how the factory did it until 1963. You would need caliper adaptors to bolt onto the uprights, these and the dust shields are common to the Vitesse 6. If you go for the post-63 setup, you will need to replace the steering arms and stub axles as they're specific to the disc upright design.

The brake hoses are no longer mounted to the side valance, instead the flexible hose terminates at a bracket fixed to the rear upper wishbone bolt. A longer rigid pipe comes under the valance and meets the hose at this bracket. Later valances are slotted to clear the pipe, earlier examples need cutting in this area. The existing holes for the drum hoses are left unfilled on disc-braked cars.

Don't overlook the master cylinder. Bore remains at 5/8", but you will need an increased reservoir to allow for the droping fluid level as the calipers self-adjust. On later heralds this was achieved with a plastic extension, available as a new part from motor sports suppliers but curiously missing from the ranges of most Triumph specialists.
https://www.merlinmotorsport.co.uk/p/girling-reservoir-extension-gmc-rex

Cheers,
Bill.

[Mark Hammond]

That's a great help, thanks.

Mark