Home > Tech Tips > Pedal Ratios / Mechanical Leverage Solution by: totalwebsystems  
Sales for Business > Consumers (B2C)
From 1st July 2021 Rally Design will not be able to process orders to retail EU customers with a product value less than £135.00 (€150.00). Above €150.00 local customs may charge VAT, import duty and handling charge. Additionally postal operators and couriers may charge a fee to collect these charges. Please note, this does not apply to UK consumers or EU B2B customers. David Elderfield, Managing Director. Last Updated 01/07/2021.
Shopping Cart
Your cart is empty!
0 items
Go to Checkout
Your Account
Your Email Address
Your Password
Did You Know?
There are currently 82 guests online.

120,030,037 visitors online since Thursday 30 September, 2004

Pedal Ratios / Mechanical Leverage by Scott Gillespie

Pedal ratio, or mechanical leverage is the ratio calculated from the length from the pivot point of the pedal to the centre of the foot pedal (A), divided by the length from the pivot point to the master cylinder push rod (B). Refer to the figures below.

Mechanical leverage is simply a means of increasing the brake force without increasing your leg effort. As 'A' gets longer and 'B' gets shorter, the mechanical leverage increases brake force without pushing harder on the pedal. The disadvantage is that the pedal stroke also increases, requiring you to push the pedal further.

With a 1" master cylinder stroke, a 100 pound push on the pedal, and the pedal having a 4:1 ratio, the force is 4 x 100 = 400 pounds, and the stroke is 4 x 1 = 4". With a 100 pound push on the pedal, and the pedal having a 6:1 ratio, the force is 6 x 100 = 600 pounds, and the stroke is 6 x 1 = 6".

Pedal Raios / Mechanical Leverage

This article was published on Friday 25 March, 2011.
Best Sellers
01.Hose Fitting Copper Washer - 3/8 & M10
02.Hose Fitting Olive #3
03.#3 Stainless Braided Brake Hose
04.Open Wheel Nut - 12mm x 1.5 - 19mm Hex - 60 Taper
05.Standard Plus 25mm - 63mm Long - 12mm x 1.5 Ford Stud
Featured Products
Blackline Digital Caster Camber Gauge
Blackline Digital Caster Camber Gauge

2020 Catalogue Request
Follow us with Rally Design for iPhone, iPad and iPod touch on the iTunes App Store
Follow us with Rally Design for Android on Google Play
Rally Design Limited • Unit 4 St. Augustine's Business Park, Estuary Way, Swalecliffe, Kent, CT5 2QJ
Vehicle Identification: References to vehicle marques such as Ford, Vauxhall, Westfield, Caterham etc. are for vehicle fitment identification purposes only.
These references must not be used to imply the vehicle manufacturers have been involved in the design of these products nor endorsement of same.
Product Images: The images shown on this website are for illustration purposes only and may not be that of the actual product. If you are unsure please ask.